[19.03] Bump docker-app to v0.8.0 (#341)

[19.03] Bump docker-app to v0.8.0
Upstream-commit: faa0a35fd752571628cfa1fb81b99bf98cc61031
Component: packaging

Author: seemethere

components/packaging/plugins/app.installer

@@ -6,7 +6,7 @@ source "$(dirname "$0")/.common"
 
 GOPATH=$(go env GOPATH)
 REPO=https://github.com/docker/app.git
-COMMIT=v0.8.0-rc1
+COMMIT=v0.8.0
 DEST=${GOPATH}/src/github.com/docker/app
 
 build() {