README typo fix

[PhilipDukhov]

README samples should be easy to copy-paste-run

[codecov]

Codecov Report

Merging #1453 (4cd4c53) into master (7582190) will decrease coverage by 0.61%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1453      +/-   ##
============================================
- Coverage     83.23%   82.62%   -0.62%     
+ Complexity     2562     2542      -20     
============================================
  Files           107      104       -3     
  Lines          7619     7471     -148     
  Branches       2103     2086      -17     
============================================
- Hits           6342     6173     -169     
- Misses          388      435      +47     
+ Partials        889      863      -26     

Flag	Coverage Δ
unittests	82.62% <ø> (-0.62%)	⬇️

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

Impacted Files	Coverage Δ
...at/ruleset/rules/chapter3/files/IndentationRule.kt	78.92% <ø> (-0.09%)	⬇️
.../kotlin/org/cqfn/diktat/plugin/maven/DiktatMojo.kt	9.09% <0.00%> (-81.82%)	⬇️
...lin/org/cqfn/diktat/plugin/maven/DiktatBaseMojo.kt	9.57% <0.00%> (-43.62%)	⬇️
...qfn/diktat/plugin/gradle/DiktatJavaExecTaskBase.kt
...rg/cqfn/diktat/plugin/gradle/DiktatGradlePlugin.kt
...n/org/cqfn/diktat/plugin/gradle/DiktatExtension.kt

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[orchestr7]

@PhilipDukhov thank you! I do not understand, how we missed that. I was 100% sure that it was correct before, but it was from the very beginning :(