update ionic and cordova

Author: Samuel Abt

Dockerfile

@@ -5,8 +5,8 @@ WORKDIR /opt
 ENV ANDROID_SDK_URL="https://dl.google.com/android/repository/tools_r25.2.5-linux.zip" \
     ANDROID_BUILD_TOOLS_VERSION=27.0.0 \
     ANDROID_APIS="android-27" \
-    IONIC_VERSION=4.1.1 \
-    CORDOVA_VERSION=8.0.0 \
+    IONIC_VERSION=4.6.0 \
+    CORDOVA_VERSION=8.1.2 \
     ANT_HOME="/usr/share/ant" \
     MAVEN_HOME="/usr/share/maven" \
     GRADLE_HOME="/usr/share/gradle" \