Deprecate two methods

[amdelamar]

timeInHex() and random(), as both are not critical to keep anyway.

Will remove them in the next minor release. #13

[codecov]

Codecov Report

Merging #16 into master will decrease coverage by 5.51%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #16      +/-   ##
============================================
- Coverage       100%   94.48%   -5.52%     
+ Complexity       50       46       -4     
============================================
  Files             5        5              
  Lines           127      127              
  Branches         21       21              
============================================
- Hits            127      120       -7     
- Misses            0        7       +7

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/com/amdelamar/jotp/OTP.java	89.39% <ø> (-10.61%)	20 <0> (-4)

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