Do not use ci in travis environment

Disable ci mode for lerna in travis environment as this requires
package-lock.json files to be commited to the repository and we do not
for the time being do this.

.travis.yml

@@ -6,7 +6,7 @@ before_install:
   - tar -xf factorio.tar.gz
   - npm install -g codecov
 script:
-  - npx lerna bootstrap
+  - npx lerna bootstrap --no-ci
   - node packages/lib/build_mod --bump-patch --factorio-version 0.18 --output-dir sharedMods
   - curl -o sharedMods/subspace_storage_1.99.1.zip -L https://github.com/clusterio/factorioClusterioMod/releases/download/1.99.1/subspace_storage_1.99.1.zip
   - npm run-script ci-cover