add pytest to requirements, re-indent .in files

requirements/requirements-dev.in

@@ -1,4 +1,5 @@
 -r requirements.in
 
-flake8			# python code quality stuff
-pip-tools		# pip-compile
+flake8                      # python code quality stuff
+pip-tools                   # pip-compile
+pytest                      # unit tests

requirements/requirements-dev.txt

@@ -4,16 +4,26 @@
 #
 #    pip-compile --output-file=requirements/requirements-dev.txt requirements/requirements-dev.in
 #
+attrs==19.3.0             # via pytest
 click==7.0                # via flask, pip-tools
 entrypoints==0.3          # via flake8
 flake8==3.7.9             # via -r requirements/requirements-dev.in
 flask==1.1.1              # via -r requirements/requirements.in
+importlib-metadata==1.5.0  # via pluggy, pytest
 itsdangerous==1.1.0       # via flask
 jinja2==2.11.1            # via flask
 markupsafe==1.1.1         # via jinja2
 mccabe==0.6.1             # via flake8
+more-itertools==8.2.0     # via pytest
+packaging==20.3           # via pytest
 pip-tools==4.5.1          # via -r requirements/requirements-dev.in
+pluggy==0.13.1            # via pytest
+py==1.8.1                 # via pytest
 pycodestyle==2.5.0        # via flake8
 pyflakes==2.1.1           # via flake8
-six==1.14.0               # via pip-tools
+pyparsing==2.4.6          # via packaging
+pytest==5.3.5             # via -r requirements/requirements-dev.in
+six==1.14.0               # via packaging, pip-tools
+wcwidth==0.1.8            # via pytest
 werkzeug==1.0.0           # via flask
+zipp==3.1.0               # via importlib-metadata

requirements/requirements.in

@@ -1 +1 @@
-Flask			# general purpose web service and web server stuff
+Flask                       # general purpose web service and web server stuff