upgrade to Archunit 1.0.0 and Java 11

[vincent-fuchs]

No description provided.

[codecov-commenter]

Codecov Report

Merging #68 (1a4aa1a) into master (556fea6) will decrease coverage by 0.14%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #68      +/-   ##
============================================
- Coverage     79.23%   79.08%   -0.15%     
- Complexity      156      157       +1     
============================================
  Files            33       33              
  Lines           703      703              
  Branches         72       72              
============================================
- Hits            557      556       -1     
  Misses          114      114              
- Partials         32       33       +1     

Impacted Files	Coverage Δ
...ConstantsAndStaticNonFinalFieldsNamesRuleTest.java	100.00% <ø> (ø)
...ons/plugin/rules/DontReturnNullCollectionTest.java	94.11% <ø> (-5.89%)	⬇️
...ommons/plugin/rules/HexagonalArchitectureTest.java	93.75% <ø> (ø)
...rale/commons/plugin/rules/NoPowerMockRuleTest.java	84.61% <ø> (ø)
...ules/StringFieldsThatAreActuallyDatesRuleTest.java	100.00% <ø> (ø)
...ommons/plugin/rules/TestClassesNamingRuleTest.java	92.00% <ø> (ø)

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