Support php5.5

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[codecov-io]

Codecov Report

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

@@           Coverage Diff           @@
##             master     #8   +/-   ##
=======================================
  Coverage       100%   100%           
- Complexity       35     38    +3     
=======================================
  Files             2      2           
  Lines            93     94    +1     
=======================================
+ Hits             93     94    +1

Impacted Files	Coverage Δ	Complexity Δ
src/JWT.php	100% <100%> (ø)	19 <19> (+1)	⬆️
src/ValidatesJWT.php	100% <100%> (ø)	19 <0> (+2)	⬆️

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