change json rpc api version to have major & minor versions

guh.pri

@@ -5,11 +5,12 @@ GUH_VERSION_STRING=$$system('dpkg-parsechangelog | sed -n -e "s/^Version: //p"')
 GUH_PLUGINS_PATH=/usr/lib/$$system('dpkg-architecture -q DEB_HOST_MULTIARCH')/guh/plugins/
 
 # define protocol versions
-JSON_PROTOCOL_VERSION=50
+JSON_PROTOCOL_VERSION_MAJOR=0
+JSON_PROTOCOL_VERSION_MINOR=50
 REST_API_VERSION=1
 
 DEFINES += GUH_VERSION_STRING=\\\"$${GUH_VERSION_STRING}\\\" \
-           JSON_PROTOCOL_VERSION=\\\"$${JSON_PROTOCOL_VERSION}\\\" \
+           JSON_PROTOCOL_VERSION=\\\"$${JSON_PROTOCOL_VERSION_MAJOR}.$${JSON_PROTOCOL_VERSION_MINOR}\\\" \
            REST_API_VERSION=\\\"$${REST_API_VERSION}\\\" \
            GUH_PLUGINS_PATH=\\\"$${GUH_PLUGINS_PATH}\\\"
 

tests/auto/api.json

@@ -1,4 +1,4 @@
-50
+0.50
 {
     "methods": {
         "Actions.ExecuteAction": {