Bump versions of coding style to 1.3.0, and parent pom to 1.3.1

[uhafner]

• Automatically run JaCoCo during verify phase
• Replace Nullable with CheckForNull. CheckForNull is now supported by NullAway as well: see Make @ChecksForNull an alias for @Nullable uber/NullAway#397

[codecov]

Codecov Report

Merging #492 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #492      +/-   ##
============================================
- Coverage     90.27%   90.27%   -0.01%     
- Complexity     1515     1517       +2     
============================================
  Files           171      171              
  Lines          4514     4513       -1     
  Branches        493      491       -2     
============================================
- Hits           4075     4074       -1     
  Misses          284      284              
  Partials        155      155              

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/edu/hm/hafner/analysis/Categories.java	100.00% <ø> (ø)	5.00 <0.00> (ø)
...java/edu/hm/hafner/analysis/FileReaderFactory.java	82.14% <ø> (ø)	10.00 <0.00> (ø)
src/main/java/edu/hm/hafner/analysis/Issue.java	76.83% <ø> (ø)	75.00 <0.00> (ø)
...main/java/edu/hm/hafner/analysis/IssueBuilder.java	100.00% <ø> (ø)	39.00 <0.00> (ø)
.../java/edu/hm/hafner/analysis/RegexpLineParser.java	83.33% <ø> (ø)	4.00 <0.00> (ø)
src/main/java/edu/hm/hafner/analysis/Severity.java	96.29% <ø> (ø)	26.00 <0.00> (ø)
...ava/edu/hm/hafner/analysis/parser/ClairParser.java	96.29% <ø> (ø)	23.00 <0.00> (ø)
.../edu/hm/hafner/analysis/parser/FindBugsParser.java	84.61% <ø> (ø)	22.00 <0.00> (ø)
...a/edu/hm/hafner/analysis/parser/TaglistParser.java	87.09% <ø> (ø)	7.00 <0.00> (ø)
...java/edu/hm/hafner/analysis/parser/ccm/Metric.java	100.00% <ø> (ø)	13.00 <0.00> (ø)
... and 21 more

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