docs: give the JitPack badge alt text

The badge was written as [![](...)], so when the image fails to load
there is nothing to fall back to and the link disappears from the header
entirely rather than degrading to a label.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: jvmvik

README.md

@@ -2,7 +2,7 @@
 # SerpApi Java Library
 
 [![serpapi-java](https://github.com/serpapi/serpapi-java/actions/workflows/gradle.yml/badge.svg)](https://github.com/serpapi/serpapi-java/actions/workflows/gradle.yml)
-[![](https://jitpack.io/v/serpapi/serpapi-java.svg)](https://jitpack.io/#serpapi/serpapi-java)
+[![JitPack](https://jitpack.io/v/serpapi/serpapi-java.svg)](https://jitpack.io/#serpapi/serpapi-java)
 
 Integrate search data into your Java application. This library is the official wrapper for [SerpApi](https://serpapi.com).
 

README.md.erb

@@ -24,7 +24,7 @@ end
 # SerpApi Java Library
 
 [![serpapi-java](https://github.com/serpapi/serpapi-java/actions/workflows/gradle.yml/badge.svg)](https://github.com/serpapi/serpapi-java/actions/workflows/gradle.yml)
-[![](https://jitpack.io/v/serpapi/serpapi-java.svg)](https://jitpack.io/#serpapi/serpapi-java)
+[![JitPack](https://jitpack.io/v/serpapi/serpapi-java.svg)](https://jitpack.io/#serpapi/serpapi-java)
 
 Integrate search data into your Java application. This library is the official wrapper for [SerpApi](https://serpapi.com).