activate jdk 11 on appveyor and update gradle to 4.10.2

we need at least gradle 4.8 => code coverage is broken in 4.8 but we
don't use it in this project, so we are safe to update to 4.10.2

appveyor.yml

@@ -3,19 +3,24 @@ version: "{branch} {build}"
 build:
   verbosity: detailed
 
+init:
+- set GRADLE_OPTS="-Dorg.gradle.daemon=false -Pkotlin.incremental=false"
+
 build_script:
-  - gr.bat assemble --no-daemon
+  - gr.bat assemble
 
 test_script:
-  - gr.bat build --no-daemon
+  - gr.bat build
 
 cache:
-- C:\Users\appveyor\.gradle
+- C:\Users\appveyor\.gradle\wrapper
+- C:\Users\appveyor\.gradle\caches
 
 environment:
   matrix:
   - JAVA_HOME: C:\Program Files\Java\jdk9
   - JAVA_HOME: C:\Program Files\Java\jdk10
+  - JAVA_HOME: C:\Program Files\Java\jdk11
 
 matrix:
   fast_finish: true

gr

@@ -33,11 +33,11 @@ DEFAULT_JVM_OPTS=""
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"
 
-warn ( ) {
+warn () {
     echo "$*"
 }
 
-die ( ) {
+die () {
     echo
     echo "$*"
     echo
@@ -155,7 +155,7 @@ if $cygwin ; then
 fi
 
 # Escape application args
-save ( ) {
+save () {
     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
     echo " "
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,5 @@
-#Mon Feb 26 16:14:48 CET 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.5.1-bin.zip