Support replacing call to url with simple patterns by path

[browniebroke]

Currently we replace url() by re_path() which is a simple rename operation. We could go one step further by looking at the URL pattern and replace the simple ones by the path() function from Django 2.0 which is less error prone.

The most basic would be to check whether the RegEx has any captured groups in it and if not, we can assume the replacement is simple.

We could later consider improving this by trying to convert URLs with only simple captured groups (slug, int, etc...).

[codecov]

Codecov Report

Merging #138 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #138   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        19    +2     
  Lines          455       548   +93     
=========================================
+ Hits           455       548   +93     

Impacted Files	Coverage Δ
django_codemod/re.py	100.00% <100.00%> (ø)
django_codemod/visitors/__init__.py	100.00% <100.00%> (ø)
django_codemod/visitors/base.py	100.00% <100.00%> (ø)
django_codemod/visitors/core.py	100.00% <100.00%> (ø)
django_codemod/visitors/decorators.py	100.00% <100.00%> (ø)
django_codemod/visitors/encoding.py	100.00% <100.00%> (ø)
django_codemod/visitors/html.py	100.00% <100.00%> (ø)
django_codemod/visitors/http.py	100.00% <100.00%> (ø)
django_codemod/visitors/lru_cache.py	100.00% <100.00%> (ø)
django_codemod/visitors/os_utils.py	100.00% <100.00%> (ø)
... and 5 more

---

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[sourcery-ai]

Sourcery Code Quality Report (beta)

Merging this PR leaves code quality unchanged.

Quality metrics	Before	After	Change
Complexity	0.43	0.42	-0.01 🔵
Method Length	25.69	24.96	-0.73 🔵
Quality	9.34	9.34	0.00

Other metrics	Before	After	Change
Lines	530	750	220

Changed files	Quality Before	Quality After	Quality Change
django_codemod/re.py		9.70
django_codemod/visitors/base.py	9.25	9.33	0.08 🔵
django_codemod/visitors/core.py	9.48	9.48	0.00
django_codemod/visitors/decorators.py	9.12	9.12	0.00
django_codemod/visitors/encoding.py	8.73	8.73	0.00
django_codemod/visitors/html.py	9.48	9.48	0.00
django_codemod/visitors/http.py	8.08	8.08	0.00
django_codemod/visitors/lru_cache.py	9.48	9.48	0.00
django_codemod/visitors/os_utils.py	9.48	9.48	0.00
django_codemod/visitors/shortcuts.py	9.60	9.60	0.00
django_codemod/visitors/translations.py	8.08	8.08	0.00
django_codemod/visitors/urls.py	9.48	9.09	-0.39 🔴
tests/visitors/test_base.py	9.50	9.50	0.00
tests/visitors/test_urls.py	9.66	9.57	-0.09 🔴

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