Fix formatting of code snippets in README (appium#1023)

Author: valfirst

README.md

@@ -25,44 +25,44 @@ Java client project is available to use even before it is officially published t
 
  - Add the following to pom.xml:
 
-```
- <repositories>
-<repository>
- <id>jitpack.io</id>
- <url>https://jitpack.io</url>
-</repository>
- </repositories>
+```xml
+<repositories>
+ <repository>
+  <id>jitpack.io</id>
+  <url>https://jitpack.io</url>
+ </repository>
+</repositories>
 ```
 
  - Add the dependency:
 
-```
- <dependency>
-  <groupId>com.github.appium</groupId>
-  <artifactId>java-client</artifactId>
-  <version>latest commit ID from master branch</version>
- </dependency>
+```xml
+<dependency>
+ <groupId>com.github.appium</groupId>
+ <artifactId>java-client</artifactId>
+ <version>latest commit ID from master branch</version>
+</dependency>
 ``` 
 
 ### Gradle
 
  - Add the JitPack repository to your build file. Add it in your root build.gradle at the end of repositories:
 
 ```
- allprojects {
-repositories {
-...
-maven { url 'https://jitpack.io' }
-}
-}
+allprojects {
+ repositories {
+ ...
+ maven { url 'https://jitpack.io' }
+ }
+}
 ```
 
  - Add the dependency:
 
 ```
- dependencies {
-implementation 'com.github.appium:java-client:latest commit id from master branch'
-}
+dependencies {
+ implementation 'com.github.appium:java-client:latest commit id from master branch'
+}
 ```
 
 ## Changelog