bump version to v0.12.1

i failed to bundle install before marking v0.12.0 :(

bump version to v0.12.0

Bump version

[synapse] bump version to 0.11.0

bump version to v0.10.0

bump version to 0.9.1

0.9.0 is broken and should not be used

bump version to 0.9.0

bump version to v0.8.0

bump version to v0.7.0

bump version to v0.6.0