Reference read-only URL in README.
Reference read-only URL in README.

In the installation instructions, reference the read-only git URL.

mbryzek/schema-evolution-manager,jonathang/schema-evolution-manager,agilemobiledev/schema-evolution-manager,keithlayne/schema-evolution-manager,Seanstoppable/schema-evolution-manager,haveal/schema-evolution-manager,mbryzek/schema-evolution-manager,evadnoob/schema-evolution-manager