1.5.0 (2019-05-15)

Features

Implemented an AST parser for setup.py for parsing package names,
dependencies, and version information if available. #106
Fully implement marker merging and consolidation logic using
requirement.merge_markers(markers). #153

Updated attrs dependency to constraint >=18.2. #142
Fixed a bug which forced early querying for dependencies via pypi or
other indexes just by simply creating a Requirement instance.
- Added the ability to skip tests requiring internet by setting
  REQUIREMENTSLIB_SKIP_INTERNET_TESTS. #145
Egg fragments on PEP-508 style direct URL dependencies are now
disregarded rather than merged with the leading name. #146
Fixed a bug which prevented the successful loading of pipfiles using
Pipfile.load. #148
Fixed a bug which prevented handling special setup.cfg directives
during dependency parsing. #150
Fixed an issue which caused the merging of markers to inadvertently
use or to merge even different variables. #153