Bumps version to 3.1.3
Bumping version to 3.1.2.
Bumping version to 3.1.1.
Bumping version to 3.1.0.
Bumping version to 3.0.0.
Bumping version to 2.2.1. This is the real final version for Swift 4.2.
Bumping version to 2.2.0 for last version supporting Swift 4.*.
Bumping version to 2.1.0
Bump pod version to 2.0.2
Bumping version to 2.0.1