add nvm install version for ghostery

README.md

@@ -139,7 +139,7 @@ Cliqz modules are pre-built and included under the `browser-core` NPM dependency
 
 ```sh
 $ npm ci
-$ ./fern.js build configs/ghostery.js --no-maps --no-debug --environment=production
+$ ./fern.js build configs/ghostery.js --environment=production --no-debug
 ```
 
 ## Compatibility

tools/amo/build.sh

@@ -41,7 +41,7 @@ rm -rf node_modules
 npm ci
 
 # Build a production version of browser-core for Ghostery
-./fern.js build configs/ghostery.js --no-maps --no-debug --environment=production
+./fern.js build configs/ghostery.js --environment=production --no-debug
 
 echo "Browser Core build complete. Please see build/ directory."
 
@@ -81,6 +81,7 @@ rm -rf build
 rm -rf node_modules
 
 # Set node version
+nvm install lts/carbon
 nvm use
 
 # Install local npm packages