Use keyID for export

Otherwise there might be multiple keys associated and gpg does not know the default key

Author: karussell

.travis.yml

@@ -21,7 +21,7 @@ matrix:
 install: true
 
 # store them into travis via https://dracoblue.net/dev/uploading-snapshots-and-releases-to-maven-central-with-travis/
-# gpg -a --export-secret-keys [email protected] | base64 -w 0
+# gpg --export-secret-keys <keyID> | base64 -w 0
 # gpg --export-ownertrust | base64 -w 0
 before_install:
   - if [ ! -z "$GPG_SECRET_KEYS" ]; then echo $GPG_SECRET_KEYS | base64 --decode | $GPG_EXECUTABLE --import; fi