Update README to include 7.6.0 release

Author: spinscale

README.md

@@ -6,6 +6,7 @@ Uses the [langdetect](https://github.com/YouCruit/language-detection/) plugin to
 
 | ES    | Command |
 | ----- | ------- |
+| 7.6.0 | `bin/elasticsearch-plugin install https://github.com/spinscale/elasticsearch-ingest-langdetect/releases/download/7.6.0.1/ingest-langdetect-7.6.0.1.zip` |
 | 7.5.2 | `bin/elasticsearch-plugin install https://github.com/spinscale/elasticsearch-ingest-langdetect/releases/download/7.5.2.1/ingest-langdetect-7.5.2.1.zip` |
 | 7.5.1 | `bin/elasticsearch-plugin install https://github.com/spinscale/elasticsearch-ingest-langdetect/releases/download/7.5.1.1/ingest-langdetect-7.5.1.1.zip` |
 | 7.5.0 | `bin/elasticsearch-plugin install https://github.com/spinscale/elasticsearch-ingest-langdetect/releases/download/7.5.0.1/ingest-langdetect-7.5.0.1.zip` |