Fixed incorrect date in java/release_notes.txt
Fixed incorrect date in java/release_notes.txt

caseykramer/libphonenumber-csharp,caseykramer/libphonenumber-csharp,caseykramer/libphonenumber-csharp,caseykramer/libphonenumber-csharp,caseykramer/libphonenumber-csharp,caseykramer/libphonenumber-csharp,caseykramer/libphonenumber-csharp