Fix #6 Recovery function

[sc0Vu]

Change:

• signature recovery param Recovery function #6
• signature recovery function Recovery function #6
• more tests Recovery function #6
• specify package version

[codecov-io]

Codecov Report

Merging #7 into master will increase coverage by 2.97%.
The diff coverage is 91.66%.

@@             Coverage Diff              @@
##             master       #7      +/-   ##
============================================
+ Coverage      80.8%   83.78%   +2.97%     
- Complexity       35       38       +3     
============================================
  Files             5        5              
  Lines            99      111      +12     
============================================
+ Hits             80       93      +13     
+ Misses           19       18       -1

Impacted Files	Coverage Δ	Complexity Δ
src/Signature/Signature.php	100% <100%> (ø)	3 <2> (+1)	⬆️
src/Signature/Signer.php	100% <100%> (ø)	10 <0> (+2)	⬆️
src/Secp256k1.php	67.92% <77.77%> (+1.88%)	18 <9> (ø)	⬇️

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