add adoptopenjdk12.rb (AdoptOpenJDK#91)

* add adoptopenjdk12.rb

* update sha

Author: George Adams

Casks/adoptopenjdk12.rb

@@ -0,0 +1,16 @@
+cask 'adoptopenjdk12' do
+  version '12,33'
+  sha256 '3b974189c4eb74aa43a365676905f6534faf599075e3910fa6ec3b8ffb101cbf'
+
+  # github.com/AdoptOpenJDK was verified as official when first introduced to the cask
+  url "https://github.com/AdoptOpenJDK/openjdk#{version.before_comma}-binaries/releases/download/jdk-#{version.before_comma}+#{version.after_comma.before_colon}/OpenJDK#{version.before_comma}U-jdk_x64_mac_hotspot_#{version.before_comma}_#{version.after_comma.before_colon}#{version.after_colon}.pkg"
+  appcast "https://github.com/adoptopenjdk/openjdk#{version.before_comma}-binaries/releases.atom"
+  name 'AdoptOpenJDK 12'
+  homepage 'https://adoptopenjdk.net/'
+
+  pkg "OpenJDK#{version.before_comma}U-jdk_x64_mac_hotspot_#{version.before_comma}_#{version.after_comma.before_colon}#{version.after_colon}.pkg"
+
+  uninstall pkgutil: [
+                       "net.adoptopenjdk.#{version.before_comma}.jdk",
+                     ]
+end

README.md

@@ -20,4 +20,5 @@ brew cask install <version>
 | OpenJDK10 with Hotspot JVM | `adoptopenjdk10` | n/a |
 | OpenJDK11 with Hotspot JVM | `adoptopenjdk11` | `adoptopenjdk11-jre` |
 | OpenJDK11 with OpenJ9 JVM | `adoptopenjdk11-openj9` | `adoptopenjdk11-openj9-jre` |
+| OpenJDK12 with Hotspot JVM | `adoptopenjdk12` | `adoptopenjdk12-jre` |
 | OpenJDK12 with OpenJ9 JVM | `adoptopenjdk12-openj9` | `adoptopenjdk12-openj9-jre` |