Fix Typo in Readme
Fix Typo in Readme

Remove unnecessary 'a' in readme.
ifeelgoods/paper_trail,devonestes/paper_trail,ifeelgoods/paper_trail,airblade/paper_trail,jnstq/paper_trail,theRealNG/paper_trail,airblade/paper_trail,jnstq/paper_trail,theRealNG/paper_trail