Document known working versions of python dependencies

requirements.lock

@@ -2,32 +2,37 @@ alabaster==0.7.10
 attrdict==2.0.0
 attrs==17.4.0
 Babel==2.5.3
-cached-property==1.4.2
-certifi==2018.4.16
+certifi==2018.1.18
 chardet==3.0.4
-Django==1.11.13
+coverage==4.5.1
+Django==1.11.12
 django-autocomplete-light==3.2.10
--e [email protected]:Princeton-CDH/djiffy.git@5a013322eb6b4ae514320f98c148ec189fc9ff09#egg=djiffy
+-e [email protected]:Princeton-CDH/djiffy.git@93e59ca2ec0f191bf210d61230ee29cebf229b71#egg=djiffy
 docutils==0.14
 future==0.16.0
 idna==2.6
 imagesize==1.0.0
+isodate==0.6.0
 Jinja2==2.10
 jsonfield==2.0.2
 MarkupSafe==1.0
 more-itertools==4.1.0
 mysqlclient==1.3.12
 packaging==17.1
-piffle==0.3.0
+piffle==0.3.0.dev0
 pluggy==0.6.0
 py==1.5.3
 Pygments==2.2.0
 pyparsing==2.2.0
-pytest==3.5.1
+pytest==3.5.0
+pytest-cov==2.5.1
+pytest-django==3.1.2
 pytz==2018.4
+rdflib==4.2.2
+rdflib-jsonld==0.4.0
 requests==2.18.4
 six==1.11.0
 snowballstemmer==1.2.1
-Sphinx==1.7.4
+Sphinx==1.7.2
 sphinxcontrib-websupport==1.0.1
 urllib3==1.22