[Java] Update .gitignore
[Java] Update .gitignore

marksantos/simple-binary-encoding,marksantos/simple-binary-encoding,real-logic/simple-binary-encoding,marksantos/simple-binary-encoding,PKRoma/simple-binary-encoding,PKRoma/simple-binary-encoding,real-logic/simple-binary-encoding,PKRoma/simple-binary-encoding,marksantos/simple-binary-encoding,marksantos/simple-binary-encoding,real-logic/simple-binary-encoding,real-logic/simple-binary-encoding,marksantos/simple-binary-encoding,real-logic/simple-binary-encoding,PKRoma/simple-binary-encoding,marksantos/simple-binary-encoding,PKRoma/simple-binary-encoding,marksantos/simple-binary-encoding,real-logic/simple-binary-encoding,PKRoma/simple-binary-encoding,PKRoma/simple-binary-encoding,real-logic/simple-binary-encoding