Update GitHub actions matching latest Java requirements

.github/workflows/build.yml

@@ -6,17 +6,16 @@ jobs:
   build:
     strategy:
       matrix:
-        java: ["8", "11"]
         os: ["ubuntu-latest"]
     runs-on: "${{ matrix.os }}"
     steps:
     - name: "Checkout Repository"
       uses: "actions/checkout@v2.3.4"
-    - name: "Setup JDK ${{ matrix.java }}"
+    - name: "Setup JDK 11"
       uses: "actions/setup-java@v2"
       with:
           distribution: "adopt"
-          java-version: "${{ matrix.java }}"
+          java-version: "11"
     - name: "Cache Gradle"
       uses: "actions/cache@v2.1.4"
       with:
@@ -30,9 +29,9 @@ jobs:
       uses: "actions/cache@v2.1.4"
       with:
         path: "~/.m2/repository"
-        key: "${{ runner.os }}-${{ matrix.java }}-maven-${{ hashFiles('**/pom.xml') }}"
+        key: "${{ runner.os }}-11-maven-${{ hashFiles('**/pom.xml') }}"
         restore-keys: |
-          "${{ runner.os }}-${{ matrix.java }}-maven-"
+          "${{ runner.os }}-11-maven-"
     - name: "Cache BuildTools Decompiled Code"
       uses: "actions/cache@v2.1.4"
       with:
@@ -40,7 +39,7 @@ jobs:
         key: "${{ runner.os }}-buildtools"
         restore-keys: |
           "${{ runner.os }}-buildtools"
-    - name: "Test Enviornment"
+    - name: "Test Environment"
       run: "echo $GITHUB_WORKSPACE"
     - name: "Download BuildTools"
       run: "wget https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/artifact/target/BuildTools.jar"
@@ -54,5 +53,3 @@ jobs:
       run: |
         rm -f ~/.gradle/caches/modules-2/modules-2.lock
         rm -f ~/.gradle/caches/modules-2/gc.properties
-
-      

COMPILING.md

@@ -1,12 +1,12 @@
 Compiling
 =========
 
-You can compile FastAsyncWorldEdit as long as you have some version of Java greater than or equal to 8 installed. Gradle will download JDK 8 specifically if needed,
+You can compile FastAsyncWorldEdit as long as you have some version of Java greater than or equal to 11 installed. Gradle will download JDK 11 specifically if needed,
 but it needs some version of Java to bootstrap from.
 
 Note that if you have JRE 8 installed, Gradle will currently attempt to use that to compile, which will not work. It is easiest to uninstall JRE 8 and replace it with JDK 8.
 
-You can get the JDK 8 [here](https://adoptopenjdk.net/?variant=openjdk8&jvmVariant=hotspot).
+You can get the JDK 11 [here](https://adoptopenjdk.net/?variant=openjdk11&jvmVariant=hotspot).
 
 The build process uses Gradle, which you do *not* need to download. FastAsyncWorldEdit is a multi-module project with three active modules:
 

CONTRIBUTING.md

@@ -8,7 +8,7 @@ ask that you make note of the following guidelines.
 * **Follow the [Oracle coding conventions](http://www.oracle.com/technetwork/java/codeconv-138413.html).**
   We can't stress this enough; if your code has notable issues, it may delay
   the process significantly.
-* **Target Java 8 for source and compilation.** Make sure to mark methods with
+* **Target Java 11 for source and compilation.** Make sure to mark methods with
   ` @Override` that override methods of parent classes, or that implement
   methods of interfaces.
 * **Use only spaces for indentation.** Our indents are 4-spaces long, and tabs