Update READMEs for mavenCentral

Author: Henigan

android/README.md

@@ -10,10 +10,10 @@ To compile with the latest release of SDL Android, include the following in your
 
 ```
 repositories {
-    jcenter()
+    mavenCentral()
 }
 dependencies {
-    implementation 'com.smartdevicelink:sdl_android:4.+'
+    implementation 'com.smartdevicelink:sdl_android:5.1.0'
 }
 ```
 

javaEE/javaEE/README.md

@@ -8,10 +8,10 @@ To compile with the latest release of SDL JavaSE, include the following in your
 
 ```sh
 repositories {
-    jcenter()
+    mavenCentral()
 }
 dependencies {
-    implementation 'com.smartdevicelink:sdl_java_se:4.+'
+    implementation 'com.smartdevicelink:sdl_java_se:5.1.0'
 }
 ```
 
@@ -22,4 +22,4 @@ If you prefer making a JAR, simply call:
 ```sh
 gradle build
 ```
-from within the project and a JAR should be generated in the `build/libs` folder
+from within the project and a JAR should be generated in the `build/libs` folder

javaSE/javaSE/README.md

@@ -8,10 +8,10 @@ To compile with the latest release of SDL JavaSE, include the following in your
 
 ```sh
 repositories {
-    jcenter()
+    mavenCentral()
 }
 dependencies {
-    implementation 'com.smartdevicelink:sdl_java_se:4.+'
+    implementation 'com.smartdevicelink:sdl_java_se:5.1.0'
 }
 ```