fixinh travis build

Author: Georgi Peltekov

.travis.yml

@@ -15,6 +15,7 @@ branches:
 # the results of previous builds to install future builds
 script:
   - rm -f package-lock.json && yarn install
+    && yarn global add tsickle
     && yarn global add ngx-file-drop
     && yarn run packagr
 # Notifications

package.json

@@ -37,7 +37,6 @@
     "@angular/common": "^7.0.0",
     "@angular/platform-browser": "^7.0.0",
     "@angular/platform-browser-dynamic": "^7.0.0",
-    "tsickle": ">=0.27.3",
     "rxjs": "^6.3.3",
     "zone.js": "0.8.26"
   },