Updated readme to inform that clang 3.4 is minimum required version. (#3158)
Updated readme to inform that clang 3.4 is minimum required version. (#3158)

* Update README.md
* Update README.md
* Update COMPILING.md
* Update COMPILING.md
* Update COMPILING.md
johnsoch/cuberite,kevinr/cuberite,kevinr/cuberite,mc-server/MCServer,QUSpilPrgm/cuberite,kevinr/cuberite,Schwertspize/cuberite,mc-server/MCServer,Frownigami1/cuberite,Frownigami1/cuberite,johnsoch/cuberite,nounoursheureux/MCServer,QUSpilPrgm/cuberite,mc-server/MCServer,johnsoch/cuberite,mc-server/MCServer,Altenius/cuberite,Altenius/cuberite,kevinr/cuberite,kevinr/cuberite,QUSpilPrgm/cuberite,Frownigami1/cuberite,QUSpilPrgm/cuberite,Altenius/cuberite,Schwertspize/cuberite,Altenius/cuberite,QUSpilPrgm/cuberite,Frownigami1/cuberite,Altenius/cuberite,nounoursheureux/MCServer,kevinr/cuberite,nounoursheureux/MCServer,johnsoch/cuberite,nounoursheureux/MCServer,mc-server/MCServer,johnsoch/cuberite,Schwertspize/cuberite,Schwertspize/cuberite,mc-server/MCServer,QUSpilPrgm/cuberite,Schwertspize/cuberite,nounoursheureux/MCServer,Frownigami1/cuberite,nounoursheureux/MCServer