(#164) updated checkstyle.xml

[llorllale]

This PR:

• closes Update checkstyle.xml #164
• updates checkstyle.xml
• Fixes checkstyle issues in src/main/java
• Leaves puzzle for the test packages

[codecov]

Codecov Report

Merging #167 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #167   +/-   ##
=======================================
  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
...va/org/llorllale/youtrack/api/DefaultComments.java	100% <100%> (ø)	⬆️
...java/org/llorllale/youtrack/api/DefaultFields.java	100% <100%> (ø)	⬆️
.../org/llorllale/youtrack/api/XmlUsersOfProject.java	100% <100%> (ø)	⬆️
...org/llorllale/youtrack/api/DefaultUpdateIssue.java	100% <100%> (ø)	⬆️
...java/org/llorllale/youtrack/api/DefaultIssues.java	100% <100%> (ø)	⬆️
...orllale/youtrack/api/DefaultIssueTimeTracking.java	100% <100%> (ø)	⬆️
...va/org/llorllale/youtrack/api/DefaultProjects.java	100% <100%> (ø)	⬆️
...main/java/org/llorllale/youtrack/api/XmlIssue.java	92.85% <100%> (ø)	⬆️
...va/org/llorllale/youtrack/api/XmlProjectField.java	96.15% <100%> (ø)	⬆️

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