Fix Travis Issue with pipenv (#39)

* pin python-dateutil version for travis

* update Pipefile.lock

* move dateutil-2.8.1 to setup.py

* fix linter issues

* update pip in travis

* remove python_requires from pipefile

* remove pandas version limit

* remove testing in travis for python >= 3.8

* remove python version

.travis.yml

@@ -7,8 +7,8 @@ python:
   - "3.6-dev"  # 3.6 development branch
   - "3.7"
   - "3.7-dev"  # 3.7 development branch
-  - "3.8-dev"  # 3.8 development branch
-  - "nightly"  # nightly build
+  # - "3.8-dev"  # 3.8 development branch
+  # - "nightly"  # nightly build
 
 cache:
   pip: true
@@ -22,6 +22,7 @@ env:
 
 before_install:
   - "sudo apt-get install python3-tk"
+  - pip install --upgrade pip
   - pip install pipenv
   - make doctor
 

Pipfile

@@ -3,9 +3,6 @@ url = "https://pypi.org/simple"
 verify_ssl = true
 name = "pypi"
 
-[requires]
-python_version = "3.5"
-
 [packages]
 responsibly = {editable = true,path = "."}
 
@@ -17,27 +14,33 @@ pycodestyle = "*"
 pep8 = "*"
 pydocstyle = "*"
 restructuredtext_lint = "*"
+
 # Testing
 pytest = "~= 3.3"
 pytest-describe = "*"
 pytest-expecter = "*"
 pytest-random = "*"
 pytest-cov = "*"
 freezegun = "*"
+
 # Reports
 coverage-space = "*"
+
 # Documentation
 sphinx = "*"
 nbconvert = "*"
 docutils = "*"
 pygments = "*"
+
 # Build
 wheel = "*"
 pyinstaller = "*"
 readme_renderer = "*"
+
 # Release
 setuptools = ">= 38.6.0"
 twine = ">= 1.11.0"
+
 # Tooling
 jupyter = "*"
 notebook = ">=5.7.8"