Improves the instructions in README.
Improves the instructions in README.

BeeswaxIO/googletest,osamu0329nakamura/googletest,gclone/googletest,Perfexion/googletest,amitkr/googletest,old8xp/googletest-from-google,marcossilvadecastro/googletest,old8xp/googletest-from-google,Perfexion/googletest,goby/googletest,marcossilvadecastro/googletest,osamu0329nakamura/googletest,dpull/googletest,dpull/googletest,BeeswaxIO/googletest,dpull/googletest,goby/googletest,marcossilvadecastro/googletest,amitkr/googletest,marcossilvadecastro/googletest,Perfexion/googletest,old8xp/googletest-from-google,osamu0329nakamura/googletest,gclone/googletest,gclone/googletest,BeeswaxIO/googletest,goby/googletest,amitkr/googletest