diff --git a/requirements.txt b/requirements.txt
index ce74a9f..1717a8b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,55 +4,133 @@
 #
 #    pip-compile requirements.in
 #
-appdirs==1.4.4            # via virtualenv
-attrs==20.3.0             # via pytest
-bump2version==1.0.1       # via -r requirements.in
-certifi==2020.12.5        # via requests
-chardet==4.0.0            # via requests
-click==7.1.2              # via pip-tools, towncrier
-coverage==5.3.1           # via pytest-cov
-distlib==0.3.1            # via virtualenv
-docopt==0.6.2             # via pipreqs
-docutils==0.16            # via flit
-filelock==3.0.12          # via tox, virtualenv
-flit-core==3.0.0          # via flit
-flit==3.0.0               # via -r requirements.in
-future==0.18.2            # via -r requirements.in
-idna==2.10                # via requests
-importlib-metadata==2.1.1  # via pluggy, pytest, tox, virtualenv
-importlib-resources==4.1.0  # via virtualenv
-incremental==17.5.0       # via towncrier
-iniconfig==1.1.1          # via pytest
-jinja2==2.11.2            # via towncrier
-markupsafe==1.1.1         # via jinja2
-mock==4.0.3               # via -r requirements.in
-numpy==1.19.4             # via -r requirements.in, pandas, patsy, scipy, statsmodels
-packaging==20.8           # via pytest, tox
-pandas==1.1.5             # via -r requirements.in, statsmodels
-patsy==0.5.1              # via statsmodels
-pip-tools==5.4.0          # via -r requirements.in
-pipreqs==0.4.10           # via -r requirements.in
-pluggy==0.13.1            # via pytest, tox
-py==1.10.0                # via pytest, tox
-pyparsing==2.4.7          # via packaging
-pytest-cov==2.10.1        # via -r requirements.in
-pytest==6.2.1             # via -r requirements.in, pytest-cov
-python-dateutil==2.8.1    # via pandas
-pytoml==0.1.21            # via flit, flit-core
-pytz==2020.5              # via pandas
-requests==2.25.1          # via flit, yarg
-scipy==1.5.4              # via -r requirements.in, statsmodels
-six==1.15.0               # via patsy, pip-tools, python-dateutil, tox, virtualenv
-statsmodels==0.12.1       # via -r requirements.in
-toml==0.10.2              # via pytest, towncrier, tox
-towncrier==19.2.0         # via -r requirements.in
-tox-conda==0.4.1          # via -r requirements.in
-tox==3.20.1               # via -r requirements.in, tox-conda
-tqdm==4.55.0              # via -r requirements.in
-urllib3==1.26.2           # via requests
-virtualenv==20.2.2        # via tox
-yarg==0.1.9               # via pipreqs
-zipp==3.4.0               # via importlib-metadata, importlib-resources
+appdirs==1.4.4
+    # via virtualenv
+attrs==20.3.0
+    # via pytest
+bump2version==1.0.1
+    # via -r requirements.in
+certifi==2020.12.5
+    # via requests
+chardet==4.0.0
+    # via requests
+click==7.1.2
+    # via
+    #   pip-tools
+    #   towncrier
+coverage==5.3.1
+    # via pytest-cov
+distlib==0.3.1
+    # via virtualenv
+docopt==0.6.2
+    # via pipreqs
+docutils==0.16
+    # via flit
+filelock==3.0.12
+    # via
+    #   tox
+    #   virtualenv
+flit-core==3.0.0
+    # via flit
+flit==3.0.0
+    # via -r requirements.in
+future==0.18.2
+    # via -r requirements.in
+idna==2.10
+    # via requests
+incremental==17.5.0
+    # via towncrier
+iniconfig==1.1.1
+    # via pytest
+jinja2==2.11.3
+    # via towncrier
+markupsafe==1.1.1
+    # via jinja2
+mock==4.0.3
+    # via -r requirements.in
+numpy==1.19.4
+    # via
+    #   -r requirements.in
+    #   pandas
+    #   patsy
+    #   scipy
+    #   statsmodels
+packaging==20.8
+    # via
+    #   pytest
+    #   tox
+pandas==1.1.5
+    # via
+    #   -r requirements.in
+    #   statsmodels
+patsy==0.5.1
+    # via statsmodels
+pip-tools==5.4.0
+    # via -r requirements.in
+pipreqs==0.4.10
+    # via -r requirements.in
+pluggy==0.13.1
+    # via
+    #   pytest
+    #   tox
+py==1.10.0
+    # via
+    #   pytest
+    #   tox
+pyparsing==2.4.7
+    # via packaging
+pytest-cov==2.10.1
+    # via -r requirements.in
+pytest==6.2.1
+    # via
+    #   -r requirements.in
+    #   pytest-cov
+python-dateutil==2.8.1
+    # via pandas
+pytoml==0.1.21
+    # via
+    #   flit
+    #   flit-core
+pytz==2020.5
+    # via pandas
+requests==2.25.1
+    # via
+    #   flit
+    #   yarg
+scipy==1.5.4
+    # via
+    #   -r requirements.in
+    #   statsmodels
+six==1.15.0
+    # via
+    #   patsy
+    #   pip-tools
+    #   python-dateutil
+    #   tox
+    #   virtualenv
+statsmodels==0.12.1
+    # via -r requirements.in
+toml==0.10.2
+    # via
+    #   pytest
+    #   towncrier
+    #   tox
+towncrier==19.2.0
+    # via -r requirements.in
+tox-conda==0.4.1
+    # via -r requirements.in
+tox==3.20.1
+    # via
+    #   -r requirements.in
+    #   tox-conda
+tqdm==4.55.0
+    # via -r requirements.in
+urllib3==1.26.2
+    # via requests
+virtualenv==20.2.2
+    # via tox
+yarg==0.1.9
+    # via pipreqs
 
 # The following packages are considered to be unsafe in a requirements file:
 # pip