Add \Phar::loadPhar() in custom autoloader with Stream Interceptor

[maks-rafalko]

Load infection.phar in custom autoloader with Stream Interceptor because
for some reason requiring interceptor file from renamed (interceptor.phar
-> interceptor) phar does not work.

After adding \Phar.loadPhar('/path/to/renamed/phar') everything works
as expected

[codecov-io]

Codecov Report

Merging #3 into master will increase coverage by 0.22%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master       #3      +/-   ##
============================================
+ Coverage     33.81%   34.03%   +0.22%     
- Complexity      666      668       +2     
============================================
  Files           113      114       +1     
  Lines          2076     2086      +10     
============================================
+ Hits            702      710       +8     
- Misses         1374     1376       +2

Impacted Files	Coverage Δ	Complexity Δ
...k/PhpUnit/Config/Builder/MutationConfigBuilder.php	0% <0%> (ø)	4 <0> (ø)	⬇️
...k/PhpSpec/Config/Builder/MutationConfigBuilder.php	97.29% <100%> (+0.15%)	7 <0> (ø)	⬇️
src/TestFramework/Config/MutationConfigBuilder.php	60% <60%> (ø)	2 <2> (?)

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