fixed finder to not find classes of functions in classes

[prisis]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
Related tickets	-
License	MIT
Doc PR	-

[codecov]

Codecov Report

Merging #68 into master will increase coverage by 0.06%.
The diff coverage is 77.77%.

@@             Coverage Diff              @@
##             master      #68      +/-   ##
============================================
+ Coverage      59.8%   59.86%   +0.06%     
- Complexity      719      723       +4     
============================================
  Files            46       46              
  Lines          1923     1936      +13     
============================================
+ Hits           1150     1159       +9     
- Misses          773      777       +4

Impacted Files	Coverage Δ	Complexity Δ
src/Common/ClassFinder.php	95.23% <77.77%> (-3%)	49 <0> (+4)

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