Fix snapcraft release flow

.travis.yml

@@ -90,9 +90,10 @@ after_success:
   - sudo /snap/bin/lxd init --auto
   - mkdir -p "$TRAVIS_BUILD_DIR/snaps-cache"
   - sudo SNAPCRAFT_ENABLE_DEVELOPER_DEBUG=y /snap/bin/snapcraft --use-lxd
-  - timeout 180 sudo /snap/bin/transfer *.snap
+  - timeout 180 sudo /snap/bin/transfer mailspring.snap
   # Decrypt the snapcraft login information
   - openssl aes-256-cbc -K $encrypted_d506bd5213c4_key -iv $encrypted_d506bd5213c4_iv -in .snapcraft/credentials.enc -out .snapcraft/credentials -d
+  - export SNAPCRAFT_STORE_CREDENTIALS=$(cat .snapcraft/credentials)
 
 after_failure:
   - test "$TRAVIS_OS_NAME" = "linux" && sudo journalctl -u snapd || true
@@ -102,5 +103,5 @@ deploy:
     branch: master
     condition: $TRAVIS_OS_NAME = linux
   provider: script
-  script: sudo snapcraft login --with .snapcraft/credentials && sudo snapcraft push *.snap --release edge || true
+  script: sudo snapcraft push mailspring.snap --release edge || true
   skip_cleanup: true