Tweak README markdown.
Tweak README markdown.

DealerDotCom/gvm-cli,GsusRecovery/sdkman-cli,dsyer/gvm,gvmtool/gvm-cli,jbovet/gvm,busches/gvm-cli,nobeans/gvm-cli,skpal/sdkman-cli,nobeans/gvm-cli,GsusRecovery/sdkman-cli,sdkman/sdkman-cli,skpal/sdkman-cli,DealerDotCom/gvm-cli,dsyer/gvm,shanman190/sdkman-cli