chore: add missing script

Author: tgpetrov

src/package.json

@@ -18,14 +18,14 @@
         "test.ios": "npm run tsc && npm run tslint && cd ../demo && tns build ios && tns test ios --justlaunch",
         "tslint": "cd .. && tslint \"**/*.ts\" --config tslint.json --exclude \"**/node_modules/**\" --exclude \"**/platforms/**\"",
         "plugin.tscwatch": "npm run tsc -- -w",
-        "demo.ios": "npm run tsc && cd ../demo && tns run ios --syncAllFiles --emulator",
-        "demo.android": "npm run tsc && cd ../demo && tns run android --syncAllFiles --emulator",
+        "demo.ios": "npm i && npm run tsc && cd ../demo && tns run ios --syncAllFiles --emulator",
+        "demo.android": "npm i && npm run tsc && cd ../demo && tns run android --syncAllFiles --emulator",
         "demo.reset": "cd ../demo && npx rimraf -- hooks node_modules platforms package-lock.json",
-        "demo.ng.ios": "npm run tsc && cd ../demo-angular && tns run ios --syncAllFiles --emulator",
-        "demo.ng.android": "npm run tsc && cd ../demo-angular && tns run android --syncAllFiles --emulator",
+        "demo.ng.ios": "npm i && npm run tsc && cd ../demo-angular && tns run ios --syncAllFiles --emulator",
+        "demo.ng.android": "npm i && npm run tsc && cd ../demo-angular && tns run android --syncAllFiles --emulator",
         "demo.ng.reset": "cd ../demo-angular && npx rimraf -- hooks node_modules platforms package-lock.json",
-        "demo.vue.ios": "npm run tsc && cd ../demo-vue && tns run ios --bundle --syncAllFiles --emulator",
-        "demo.vue.android": "npm run tsc && cd ../demo-vue && tns run android --bundle --syncAllFiles --emulator",
+        "demo.vue.ios": "npm i && npm run tsc && cd ../demo-vue && tns run ios --bundle --syncAllFiles --emulator",
+        "demo.vue.android": "npm i && npm run tsc && cd ../demo-vue && tns run android --bundle --syncAllFiles --emulator",
         "demo.vue.reset": "cd ../demo-vue && npx rimraf -- hooks node_modules platforms package-lock.json",
         "plugin.prepare": "npm run build && cd ../demo && tns plugin remove nativescript-datetimepicker && tns plugin add ../src",
         "clean": "npm run demo.reset && npx rimraf -- node_modules package-lock.json && npm i",