Add slashes for standard functions because of namespace lookup optimize

[KartaviK]

No description provided.

[codecov]

Codecov Report

Merging #9 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master     #9   +/-   ##
=======================================
  Coverage       100%   100%           
  Complexity       34     34           
=======================================
  Files             6      6           
  Lines           102    102           
=======================================
  Hits            102    102

Impacted Files	Coverage Δ	Complexity Δ
src/HasToken.php	100% <100%> (ø)	3 <0> (ø)	⬇️
src/Repository.php	100% <100%> (ø)	14 <0> (ø)	⬇️
src/Bootstrap.php	100% <100%> (ø)	3 <0> (ø)	⬇️
src/Config.php	100% <100%> (ø)	9 <0> (ø)	⬇️

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