diff --git a/requirements_dev.txt b/requirements_dev.txt
index 8f9663b..914f0f5 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,50 +4,115 @@
 #
 #    pip-compile --output-file requirements_dev.txt requirements_dev.in
 #
-alabaster==0.7.10         # via sphinx
-argh==0.26.2              # via watchdog
-atomicwrites==1.1.5       # via pytest
-attrs==18.1.0             # via pytest
-babel==2.6.0              # via sphinx
+alabaster==0.7.10
+    # via sphinx
+argh==0.26.2
+    # via watchdog
+atomicwrites==1.1.5
+    # via pytest
+attrs==18.1.0
+    # via pytest
+babel==2.6.0
+    # via sphinx
 bumpversion==0.5.3
-certifi==2018.4.16        # via requests
-chardet==3.0.4            # via requests
+    # via -r requirements_dev.in
+certifi==2018.4.16
+    # via requests
+chardet==3.0.4
+    # via requests
+configparser==4.0.2
+    # via flake8
 coverage==4.5.1
-docutils==0.14            # via sphinx
+    # via -r requirements_dev.in
+docutils==0.14
+    # via sphinx
+enum34==1.1.10
+    # via flake8
 flake8==3.5.0
-idna==2.7                 # via requests
-imagesize==1.0.0          # via sphinx
-jinja2==2.10              # via sphinx
-markupsafe==1.0           # via jinja2
-mccabe==0.6.1             # via flake8
-more-itertools==4.2.0     # via pytest
-packaging==17.1           # via sphinx
-pathtools==0.1.2          # via watchdog
-pkginfo==1.4.2            # via twine
-pluggy==0.6.0             # via pytest, tox
-py==1.5.3                 # via pytest, tox
-pycodestyle==2.3.1        # via flake8
-pyflakes==1.6.0           # via flake8
-pygments==2.2.0           # via sphinx
-pyparsing==2.2.0          # via packaging
+    # via -r requirements_dev.in
+funcsigs==1.0.2
+    # via pytest
+idna==2.7
+    # via requests
+imagesize==1.0.0
+    # via sphinx
+jinja2==2.11.3
+    # via sphinx
+markupsafe==1.0
+    # via jinja2
+mccabe==0.6.1
+    # via flake8
+more-itertools==4.2.0
+    # via pytest
+packaging==17.1
+    # via sphinx
+pathtools==0.1.2
+    # via watchdog
+pkginfo==1.4.2
+    # via twine
+pluggy==0.6.0
+    # via
+    #   pytest
+    #   tox
+py==1.5.3
+    # via
+    #   pytest
+    #   tox
+pycodestyle==2.3.1
+    # via flake8
+pyflakes==1.6.0
+    # via flake8
+pygments==2.2.0
+    # via sphinx
+pyparsing==2.2.0
+    # via packaging
 pytest-runner==4.2
+    # via -r requirements_dev.in
 pytest==3.6.1
-pytz==2018.4              # via babel
-pyyaml==3.12              # via watchdog
-requests-toolbelt==0.8.0  # via twine
-requests==2.19.1          # via requests-toolbelt, sphinx, twine
-six==1.11.0               # via more-itertools, packaging, pytest, sphinx, tox
-snowballstemmer==1.2.1    # via sphinx
+    # via -r requirements_dev.in
+pytz==2018.4
+    # via babel
+pyyaml==3.12
+    # via watchdog
+requests-toolbelt==0.8.0
+    # via twine
+requests==2.19.1
+    # via
+    #   requests-toolbelt
+    #   sphinx
+    #   twine
+six==1.11.0
+    # via
+    #   more-itertools
+    #   packaging
+    #   pytest
+    #   sphinx
+    #   tox
+snowballstemmer==1.2.1
+    # via sphinx
 sphinx-rtd-theme==0.4.0
+    # via -r requirements_dev.in
 sphinx==1.7.5
-sphinxcontrib-websupport==1.1.0  # via sphinx
+    # via -r requirements_dev.in
+sphinxcontrib-websupport==1.1.0
+    # via sphinx
 tox==3.0.0
-tqdm==4.23.4              # via twine
+    # via -r requirements_dev.in
+tqdm==4.23.4
+    # via twine
 twine==1.11.0
-urllib3==1.23             # via requests
-virtualenv==16.0.0        # via tox
+    # via -r requirements_dev.in
+typing==3.7.4.3
+    # via sphinx
+urllib3==1.23
+    # via requests
+virtualenv==16.0.0
+    # via tox
 watchdog==0.8.3
+    # via -r requirements_dev.in
 wheel==0.31.1
+    # via -r requirements_dev.in
 
 # The following packages are considered to be unsafe in a requirements file:
 # pip
+# setuptools