Merge pull request #15 from shutter-network/release/bump-keyper-v1.3.8

bump keyper version to v1.3.8

Author: blockchainluffy

docker-compose.yml

@@ -12,7 +12,7 @@ services:
     build:
       context: shutter
       args:
-        UPSTREAM_VERSION: v1.3.5
+        UPSTREAM_VERSION: v1.3.8
         KEYPER_CONFIG_DIR: /keyper/config
         SHUTTER_CHAIN_DIR: /chain
         STAKER_SCRIPTS_VERSION: v0.1.1