Bump README to 3.0.0

Author: JonasVautherin

README.md

@@ -19,7 +19,7 @@ MAVSDK-Java is distributed through MavenCentral, meaning that it can be imported
 ```
 dependencies {
     ...
-    implementation 'io.mavsdk:mavsdk:2.1.0'
+    implementation 'io.mavsdk:mavsdk:3.0.0'
     ...
 }
 ```
@@ -29,8 +29,8 @@ For Android, `mavsdk_server` is distributed as an Android library (`aar`):
 ```
 dependencies {
     ...
-    implementation 'io.mavsdk:mavsdk:2.1.0'
-    implementation 'io.mavsdk:mavsdk-server:2.1.6'
+    implementation 'io.mavsdk:mavsdk:3.0.0'
+    implementation 'io.mavsdk:mavsdk-server:3.0.0'
     ...
 }
 ```

mavsdk_server/build.gradle

@@ -124,7 +124,7 @@ android {
         archivesBaseName = 'mavsdk-server'
         group = 'io.mavsdk'
         versionCode 3
-        version '2.1.6'
+        version '3.0.0'
 
         ndk {
             abiFilters 'arm64-v8a', 'armeabi-v7a', 'x86', 'x86_64'