Add gem version badge to readme
Add gem version badge to readme

Change-Id: I2d2acaa25111568d7e4247ee4aa6ef8224fa601f
Reviewed-on: http://gerrit.causes.com/37029
Reviewed-by: Shane da Silva <6f6e68d1df92f30cb4b3ce35260ddf94a402f33d@causes.com>
Reviewed-by: Henric Trotzig <f5a3082dfc399666895f58d2777281f9ac20aad5@causes.com>
Tested-by: Joe Lencioni <1dd72cf724deaab5db236f616560fc7067b734e1@causes.com>

500friends/db-query-matchers