Use environment vars; fix modularising a bit

requirements-dev.txt

@@ -2,28 +2,28 @@
 # This file is autogenerated by pip-compile
 # To update, run:
 #
-#    pip-compile requirements-dev.in --upgrade
+#    pip-compile requirements-dev.in
 #
-astroid==2.2.5            # via pylint
-beautifulsoup4==4.7.1     # via bs4
+astroid==2.3.3            # via pylint
+beautifulsoup4==4.8.2     # via bs4
 bs4==0.0.1
-certifi==2019.3.9         # via requests
+certifi==2019.11.28       # via requests
 chardet==3.0.4            # via requests
 click==7.0                # via flask
-flask==1.0.2
+flask==1.1.1
 idna==2.8                 # via requests
-isort==4.3.17             # via pylint
+isort==4.3.21             # via pylint
 itsdangerous==1.1.0       # via flask
-jinja2==2.10.1            # via flask
-lazy-object-proxy==1.3.1  # via astroid
+jinja2==2.10.3            # via flask
+lazy-object-proxy==1.4.3  # via astroid
 markupsafe==1.1.1         # via jinja2
 mccabe==0.6.1             # via pylint
-peewee==3.9.3
-pylint==2.3.1
-requests==2.21.0
-six==1.12.0               # via astroid
-soupsieve==1.9            # via beautifulsoup4
-typed-ast==1.3.1          # via astroid
-urllib3==1.24.1           # via requests
-werkzeug==0.15.2          # via flask
-wrapt==1.11.1             # via astroid
+peewee==3.13.1
+pylint==2.4.4
+requests==2.22.0
+six==1.13.0               # via astroid
+soupsieve==1.9.5          # via beautifulsoup4
+typed-ast==1.4.0          # via astroid
+urllib3==1.25.7           # via requests
+werkzeug==0.16.0          # via flask
+wrapt==1.11.2             # via astroid