Add newline to the end of OCMArgAction.h
Add newline to the end of OCMArgAction.h

Resolves build warnings/errors with -Wnewline-eof
imhuntingwabbits/ocmock,firebase/ocmock,erikdoe/ocmock,erikdoe/ocmock,Lightricks/ocmock,BohdanOrlov/ocmock,Lightricks/ocmock,Lightricks/ocmock,Lightricks/ocmock,erikdoe/ocmock,erikdoe/ocmock