Update to go1.13 in f31

Dockerfile

@@ -1,7 +1,7 @@
-FROM registry.fedoraproject.org/f30/s2i-base:latest
+FROM registry.fedoraproject.org/f31/s2i-base:latest
 
 ENV NAME=golang \
-    VERSION=1.11 \
+    VERSION=1.13 \
     ARCH=x86_64
 
 ENV SUMMARY="Platform for building and running Go $VERSION based applications" \
@@ -14,7 +14,7 @@ LABEL summary="$SUMMARY" \
       description="$DESCRIPTION" \
       io.k8s.description="$DESCRIPTION" \
       io.k8s.display-name="Go $VERSION" \
-      io.openshift.tags="builder,golang,golang18,rh-golang18,go" \
+      io.openshift.tags="builder,golang,golang113,rh-golang113,go" \
       com.redhat.component="$NAME" \
       name="$FGC/$NAME" \
       version="$VERSION" \

s2i/bin/assemble

@@ -61,6 +61,7 @@ if [[ `go list -f {{.Incomplete}}` == "true" || ! -z "$IMPORT_URL" ]]; then
 
     fi
 
+    echo "ERROR: Package is missing dependencies and IMPORT_URL inference failed. Set IMPORT_URL env var."
     exec /$STI_SCRIPTS_PATH/usage
 
 else