Remove exact versions from Pipfile:

Pipfile

@@ -4,76 +4,76 @@ verify_ssl = true
 name = "pypi"
 
 [packages]
-coveralls = "==1.5.1"
-dateparser = "==0.7.0"
-django-cors-headers = "==2.4.0"
-django-crispy-forms = "==1.7.2"
-django-extensions = "==2.1.4"
-django-filter = "==2.1.0"
-djangorestframework = "==3.9.1"
-factory-boy = "==2.11.1"
-filemagic = "==1.6"
-fuzzywuzzy = {extras = ["speedup"],version = "==0.15.0"}
-gunicorn = "==19.9.0"
-langdetect = "==1.0.7"
-pdftotext = "==2.1.1"
-pyocr = "==0.5.3"
-python-dateutil = "==2.7.5"
-python-dotenv = "==0.10.1"
-python-gnupg = "==0.4.4"
-pytz = "==2018.9"
-tox = "==3.7.0"
-pycodestyle = "==2.4.0"
-pytest = "==4.1.1"
-pytest-cov = "==2.6.1"
-pytest-django = "==3.4.5"
-pytest-sugar = "==0.9.2"
-pytest-env = "==0.6.2"
-pytest-xdist = "==1.26.0"
-psycopg2 = "==2.7.7"
-djangoql = "==0.12.3"
-whitenoise = "==4.1.3"
-alabaster = "==0.7.12"
-apipkg = "==1.5"
-atomicwrites = "==1.2.1"
-attrs = "==18.2.0"
-certifi = "==2018.11.29"
-chardet = "==3.0.4"
-coverage = "==4.5.2"
-docopt = "==0.6.2"
-docutils = "==0.14"
-execnet = "==1.5.0"
-filelock = "==3.0.10"
-idna = "==2.8"
-imagesize = "==1.1.0"
-more-itertools = "==5.0.0"
-pluggy = "==0.8.1"
-ply = "==3.11"
-py = "==1.7.0"
-pyparsing = "==2.3.1"
-pytest-forked = "==1.0.1"
-regex = "==2019.1.24"
-requests = "==2.21.0"
-six = "==1.12.0"
-snowballstemmer = "==1.2.1"
-sphinxcontrib-websupport = "==1.1.0"
-termcolor = "==1.1.0"
-text-unidecode = "==1.2"
-toml = "==0.10.0"
-tzlocal = "==1.5.1"
-urllib3 = "==1.24.1"
-virtualenv = "==16.3.0"
-Django = "==2.0.10"
-Pillow = "==5.4.1"
-inotify_simple = "==1.1.8"
-Sphinx = "==1.8.3"
-Brotli = "==1.0.7"
-Babel = "==2.6.0"
-Faker = "==1.0.2"
-Jinja2 = "==2.10"
-MarkupSafe = "==1.1.0"
-Pygments = "==2.3.1"
-python-Levenshtein = "==0.12.0"
+coveralls = "*"
+dateparser = "*"
+django-cors-headers = "*"
+django-crispy-forms = "*"
+django-extensions = "*"
+django-filter = "*"
+djangorestframework = "*"
+factory-boy = "*"
+filemagic = "*"
+fuzzywuzzy = {extras = ["speedup"], version = "==0.15.0"}
+gunicorn = "*"
+langdetect = "*"
+pdftotext = "*"
+pyocr = "*"
+python-dateutil = "*"
+python-dotenv = "*"
+python-gnupg = "*"
+pytz = "*"
+tox = "*"
+pycodestyle = "*"
+pytest = "*"
+pytest-cov = "*"
+pytest-django = "*"
+pytest-sugar = "*"
+pytest-env = "*"
+pytest-xdist = "*"
+psycopg2 = "*"
+djangoql = "*"
+whitenoise = "*"
+alabaster = "*"
+apipkg = "*"
+atomicwrites = "*"
+attrs = "*"
+certifi = "*"
+chardet = "*"
+coverage = "*"
+docopt = "*"
+docutils = "*"
+execnet = "*"
+filelock = "*"
+idna = "*"
+imagesize = "*"
+more-itertools = "*"
+pluggy = "*"
+ply = "*"
+py = "*"
+pyparsing = "*"
+pytest-forked = "*"
+regex = "*"
+requests = "*"
+six = "*"
+snowballstemmer = "*"
+sphinxcontrib-websupport = "*"
+termcolor = "*"
+text-unidecode = "*"
+toml = "*"
+tzlocal = "*"
+urllib3 = "*"
+virtualenv = "*"
+Django = "<2.1,>=2.0"
+Pillow = "*"
+inotify_simple = "*"
+Sphinx = "*"
+Brotli = "*"
+Babel = "*"
+Faker = "*"
+Jinja2 = "*"
+MarkupSafe = "*"
+Pygments = "*"
+python-Levenshtein = "*"
 
 [dev-packages]
 ipython = "*"