Update versions in pom.xml and documentation after 0.1.1 release

[github-actions]

• Versions are updated in pom.xml, README.md and build.gradle.kts
• Current project version is incremented to the next snapshot

[codecov]

Codecov Report

Merging #353 into master will decrease coverage by 0.44%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #353      +/-   ##
============================================
- Coverage     83.23%   82.79%   -0.45%     
+ Complexity     1231     1182      -49     
============================================
  Files            61       58       -3     
  Lines          3138     2935     -203     
  Branches       1038      930     -108     
============================================
- Hits           2612     2430     -182     
+ Misses          177      169       -8     
+ Partials        349      336      -13     

Flag	Coverage Δ	Complexity Δ
#unittests	82.79% <ø> (-0.45%)	1182.00 <ø> (-49.00)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...cqfn/diktat/ruleset/rules/ImmutableValNoVarRule.kt	85.71% <0.00%> (-6.88%)	5.00% <0.00%> (-8.00%)
...in/org/cqfn/diktat/ruleset/rules/files/FileSize.kt	66.66% <0.00%> (-3.93%)	8.00% <0.00%> (-2.00%)
...tlin/org/cqfn/diktat/ruleset/utils/AstNodeUtils.kt	82.82% <0.00%> (-3.61%)	0.00% <0.00%> (ø%)
...fn/diktat/ruleset/rules/files/FileStructureRule.kt	57.14% <0.00%> (-3.14%)	19.00% <0.00%> (-5.00%)
...at/ruleset/rules/identifiers/LocalVariablesRule.kt	92.06% <0.00%> (-0.57%)	32.00% <0.00%> (-21.00%)
.../ruleset/utils/search/VariablesWithUsagesSearch.kt
...eset/utils/search/VariablesWithAssignmentSearch.kt
...qfn/diktat/ruleset/utils/search/VariablesSearch.kt

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