ForbiddenMethodCall: report operator calls

[t-kameyama]

#3029 (comment)

[codecov]

Codecov Report

Merging #3032 into master will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #3032      +/-   ##
============================================
+ Coverage     79.16%   79.21%   +0.04%     
- Complexity     2543     2549       +6     
============================================
  Files           434      434              
  Lines          7728     7735       +7     
  Branches       1466     1465       -1     
============================================
+ Hits           6118     6127       +9     
  Misses          824      824              
+ Partials        786      784       -2     

Impacted Files	Coverage Δ	Complexity Δ
...turbosch/detekt/rules/style/ForbiddenMethodCall.kt	92.00% <100.00%> (+14.22%)	10.00 <3.00> (+6.00)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 085adf0...11d71e3. Read the comment docs.

[arturbosch]

Good one!

Closes #3029