(#169) Renamed Login.login() -> Login.session()

[llorllale]

This PR:

• closes Rename Login.login() -> Login.session() #169
• Renames Login.login() -> Login.session()

[codecov]

Codecov Report

Merging #194 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #194   +/-   ##
=======================================
  Coverage   97.57%   97.57%           
=======================================
  Files          47       47           
  Lines         619      619           
  Branches       28       28           
=======================================
  Hits          604      604           
  Misses         14       14           
  Partials        1        1

Impacted Files	Coverage Δ
...llorllale/youtrack/api/session/PermanentToken.java	100% <ø> (ø)	⬆️
.../org/llorllale/youtrack/api/session/Anonymous.java	100% <ø> (ø)	⬆️
...orllale/youtrack/api/session/UsernamePassword.java	93.1% <ø> (ø)	⬆️
...n/java/org/llorllale/youtrack/api/CachedLogin.java	100% <100%> (ø)	⬆️

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