Update mono version to 5.12.0.226

Dockerfile

@@ -5,7 +5,7 @@ LABEL maintainer="Burak Ince <[email protected]>"
 ENV SONAR_SCANNER_MSBUILD_VERSION=4.2.0.1214 \
     SONAR_SCANNER_VERSION=3.1.0.1141 \
     DOTNET_SDK_VERSION=2.1.200 \
-    MONO_DEBIAN_VERSION=5.10.1.47-0xamarin4+debian9b1 \
+    MONO_DEBIAN_VERSION=5.12.0.226-0xamarin3+debian9b1 \
     SONAR_SCANNER_MSBUILD_HOME=/opt/sonar-scanner-msbuild \
     DOTNET_PROJECT_DIR=/project \
     DOTNET_SKIP_FIRST_TIME_EXPERIENCE=true \

README.md

@@ -6,14 +6,14 @@ Sonar Scanner MsBuild Dockerfile for .Net Core Projects
 
 ## This Image Using
 
-|                | Name          | Version          |
-| -------------- |:-------------:| ----------------:|
-| OS             | Debian        |      Stretch (9) |
-| Java           | OpenJDK       |     8 Update 171 |
-| .NET Framework | Mono          | Stable 5.10.1.47 |
-| .NET SDK       | .NET Core SDK |          2.1.105 |
-| Sonar Scanner  | CLI           |       3.1.0.1141 |
-| Sonar Scanner  | MS Build      |       4.2.0.1214 |
+|                | Name          | Version      |
+| -------------- |:-------------:| ------------:|
+| OS             | Debian        |  Stretch (9) |
+| Java           | OpenJDK       | 8 Update 171 |
+| .NET Framework | Mono          |   5.12.0.226 |
+| .NET SDK       | .NET Core SDK |      2.1.105 |
+| Sonar Scanner  | CLI           |   3.1.0.1141 |
+| Sonar Scanner  | MS Build      |   4.2.0.1214 |
 
 Please check [Releases Page](https://github.com/burakince/docker-dotnet-sonarscanner/releases) for details.