[Snyk] Upgrade @ionic-native/core from 4.11.0 to 4.20.0

Snyk has created this PR to upgrade @ionic-native/core from 4.11.0 to 4.20.0.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

The recommended version is 11 versions ahead of your current version.
The recommended version was released a year ago, on 2019-01-20.

Release notes

Package name: @ionic-native/core

4.20.0 - 2019-01-20
Bug Fixes
- bluetooth-le: Fix typo in interface definition (#2881) (c2f4561)
- health: fix typos (#2831) (ea3150e)
Features
- adjust: add adjust sdk plugin (#2872) (9e6705d)
- admob: add plugin (#2864) (707ce1c)
- analytics-firebase: add plugin (#2862) (5df3de7)
- background-geolocation: add v3 functions and interfaces (#2393) (1ba6f97)
- baidu-push: add plugin (#2838) (c3de8df)
- firebase: add clearAllNotifications method (#2867) (7c46d8c)
- gao-de-location: add plugin (#2857) (e2b25de)
- in-app-browser: add 'beforeload' as option (#2863) (d33bcb0)
- lottie-splash-screen: add new plugin (#2880) (603d694)
- web-intent: Add missing type info (#2878) (3226f76)
4.19.0 - 2019-01-04
4.18.0 - 2018-12-01
Bug Fixes
- local-notifications: update type of the every property (#2825) (b166cc5)
Features
- downloader: add plugin (#2820) (0065704)
- line-login: add loginWeb function (#2810) (7145afa)
4.17.0 - 2018-11-02
Bug Fixes
- contacts plugin: add the rawId parameter (#2799) (b61b339)
Features
- crashlytics: allow user to set userIdentifier for crashlytics (#2792) (a3bd197)
- firebase-authentication: add plugin (#2797) (43bfeb4)
- line-login: add plugin (#2782) (dc4183d)
4.16.0 - 2018-10-17
Bug Fixes
- keyboard: add missing property (fcd6d26)
- local-notifications: add missing functions (#2779) (336b3ff), closes #2778
Features
- admob-plus: Add admob-plus (#2753) (6c99ec8)
- firebase-messaging: add revokeToken function (#2763) (1a2dc3e)
- lastCam: add plugin (#2759) (99cebcb)
- nfc: add NFC readerMode (#2777) (2aa73b5)
- speechkit: plugin updated with voice parameter (#2761) (4468b52)
4.15.0 - 2018-09-25
Bug Fixes
- keyboard: use cordova-plugin-ionic-keyboard (#2743) (1457a16), closes #2306
Features
- plugins: add AppleWallet (#2740) (307477d)
- plugins: add web-server plugin (#2726) (8116ddd)
- siri-shortcuts: Add clear option for the activated shortcut (#2734) (3eff280)
- taptic-engine: add missing functions and types (a6bcc9a)
4.14.0 - 2018-09-18
4.13.0 - 2018-09-15
4.12.2 - 2018-08-31
4.12.1 - 2018-08-31
4.12.0 - 2018-08-16
4.11.0 - 2018-07-29