Fix python 3.4 compatibility issues

Makefile

@@ -59,26 +59,21 @@ test-verbose:
 test-coverage:
 	pipenv run py.test -v --cov $(MODULE) --cov-report term-missing
 
-dists: requirements sdist bdist wheels
+dists: sdist bdist wheels
 
-requirements:
-	pipenv run pipenv_to_requirements -f
-
-release: requirements
-
-sdist: requirements
+sdist:
 	pipenv run python setup.py sdist
 
-bdist: requirements
+bdist:
 	pipenv run python setup.py bdist
 
-wheels: requirements
+wheels:
 	pipenv run python setup.py bdist_wheel
 
-pypi-publish: build release
+pypi-publish: build
 	pipenv run twine upload --repository pypi dist/*.whl
 
-pypi-test-publish: build release
+pypi-test-publish: build
 	pipenv run twine upload --repository testpypi dist/*.whl
 
 update:
@@ -92,8 +87,6 @@ push: githook
 clean:
 	pipenv --rm
 
-prepare-release: requirements
-
 # aliases to gracefully handle typos on poor dev's terminal
 check: checks
 devel: dev

Pipfile

@@ -4,24 +4,14 @@ verify_ssl = true
 name = "pypi"
 
 [packages]
-flask = "*"
-flask-wtf = "*"
-flask-babel = "*"
-keyboard = "*"
-six = "*"
-"flask-bootstrap-4-alpha" = "*"
+keyboard = ">=0.13,<0.14"
+six = ">=1.8.0"
+"flask-bootstrap-4-alpha" = "==4.0.0b3.dev2"
+Flask = "==1.0.2"
+Flask-WTF = "==0.14.2"
+Flask-Babel = "==0.11.2"
 
 [dev-packages]
-pytest = "*"
-pipenv-to-requirements = "*"
-coverage = "*"
-blinker = "*"
-flask-debugtoolbar = "*"
-mock = "*"
-requests = "*"
 
 [requires]
-python_version = "3"
-
-[pipenv]
-allow_prereleases = true
+python_version = "3.7"