Merge PR #2061: Change proposalID to proposal-id in gov REST

Close #1963.

PENDING.md

@@ -8,6 +8,7 @@ BREAKING CHANGES
 * Gaia CLI  (`gaiacli`)
     * [x/stake] Validator.Owner renamed to Validator.Operator
     * [cli] unsafe_reset_all, show_validator, and show_node_id have been renamed to unsafe-reset-all, show-validator, and show-node-id
+    * [cli] \#2061 changed proposalID in governance REST endpoints to proposal-id
     * [cli] \#2014 `gaiacli advanced` no longer exists - to access `ibc`, `rest-server`, and `validator-set` commands use `gaiacli ibc`, `gaiacli rest-server`, and `gaiacli tendermint`, respectively
 
 * Gaia

x/gov/client/rest/rest.go

@@ -17,7 +17,7 @@ import (
 // REST Variable names
 // nolint
 const (
-	RestProposalID     = "proposalID"
+	RestProposalID     = "proposal-id"
 	RestDepositer      = "depositer"
 	RestVoter          = "voter"
 	RestProposalStatus = "status"