Enhancement: Implement CallableNormalizer

[localheinz]

This PR

• implements a CallableNormalizer

[codecov]

Codecov Report

Merging #8 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master     #8   +/-   ##
=======================================
  Coverage       100%   100%           
- Complexity       17     21    +4     
=======================================
  Files             4      5    +1     
  Lines            41     50    +9     
=======================================
+ Hits             41     50    +9

Impacted Files	Coverage Δ	Complexity Δ
src/CallableNormalizer.php	100% <100%> (ø)	4 <4> (?)

---

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 021e387...dc65c47. Read the comment docs.