Update Python, Django and mysqlclient

Pipfile

@@ -4,14 +4,14 @@ url = "https://pypi.org/simple"
 verify_ssl = true
 
 [requires]
-python_version = "2.7"
+python_version = "3.6"
 
 [packages]
 "django-bootstrap3" = "*"
 "django-tables2" = "==2.0.6"
 "django.js" = {editable = true,git = "https://git@github.com/aptivate/django.js.git",ref = "ca328a94b00023bd64f4fc1c908675edaaf2ac19"}
 "linecache2" = "*"
-Django = ">1.11.22,<2.0"
+Django = ">2.2.8,<3.0"
 Pillow = "*"
 cssmin = "*"
 django-assets = "*"
@@ -30,7 +30,7 @@ openpyxl = "*"
 python-dateutil = "*"
 pytz = "*"
 rest-pandas = "*"
-pymysql = "*"
+mysqlclient = "*"
 django-debug-toolbar-template-timings = "*"
 
 [dev-packages]