update to remove xonsh deprecation warning

src/regolith/deploy.py

@@ -5,7 +5,7 @@
 from distutils.dir_util import copy_tree
 from warnings import warn
 
-from xonsh.lib import subprocess
+from xonsh.api import subprocess
 
 try:
     import hglib

src/regolith/helpers/basehelper.py

@@ -5,7 +5,7 @@
 from itertools import groupby
 
 from jinja2 import Environment, FileSystemLoader
-from xonsh.lib import subprocess
+from xonsh.api import subprocess
 
 from regolith.sorters import category_val, date_key, doc_date_key, level_val
 from regolith.tools import LATEX_OPTS, date_to_rfc822, gets, latex_safe, latex_safe_url, month_and_year, rfc822now

src/regolith/tests/bootstrap_builders.py

@@ -5,7 +5,7 @@
 import tempfile
 from copy import deepcopy
 
-from xonsh.lib import subprocess
+from xonsh.api import subprocess
 
 from regolith.broker import load_db
 from regolith.fsclient import dump_yaml

src/regolith/tests/conftest.py

@@ -10,8 +10,8 @@
 import pytest
 from pymongo import MongoClient
 from pymongo import errors as mongo_errors
-from xonsh.lib import subprocess
-from xonsh.lib.os import rmtree
+from xonsh.api import subprocess
+from xonsh.api.os import rmtree
 
 from regolith.fsclient import dump_yaml
 from regolith.schemas import EXEMPLARS

src/regolith/tests/test_validate.py

@@ -4,7 +4,7 @@
 from subprocess import CalledProcessError
 
 import pytest
-from xonsh.lib import subprocess
+from xonsh.api import subprocess
 
 from regolith.main import main