chore: add 7.8.0 in the release history

Author: missedone

README.md

@@ -39,6 +39,7 @@ Plugin Version            | Online Update-Site | Zipped Update-Site
 LATEST RELEASE   | `https://testng.org/testng-eclipse-update-site` | [here](https://testng.org/testng-eclipse-update-site)
 LATEST BETA | `https://testng.org/testng-eclipse-update-site` | [here](https://testng.org/testng-eclipse-update-site)
 History:||
+7.8.0.202306071550      | `https://testng.org/testng-eclipse-update-site/7.8.0/` | [download](https://testng.org/testng-eclipse-update-site/zipped/7.8.0.202306071550/org.testng.eclipse.updatesite.zip)
 7.4.0.202106051955      | `https://testng.org/testng-eclipse-update-site/7.4.0/` | [download](https://testng.org/testng-eclipse-update-site/zipped/7.4.0.202106051955/org.testng.eclipse.updatesite.zip)
 7.4.0.202105021622      | `https://testng.org/testng-eclipse-update-site/7.4.0/` | [download](https://testng.org/testng-eclipse-update-site/zipped/7.4.0.202105021622/org.testng.eclipse.updatesite.zip)
 7.3.0.202008060412      | `https://testng.org/testng-eclipse-update-site/7.3.0/` | [download](https://testng.org/testng-eclipse-update-site/zipped/7.3.0.202008060412/org.testng.eclipse.updatesite.zip)
@@ -58,7 +59,7 @@ History:||
 6.9.10.201512240000       | `https://testng.org/testng-eclipse-update-site/6.9.10/` | [download](https://testng.org/testng-eclipse-update-site/zipped/6.9.10.201512240000/site_assembly.zip)
 6.9.5.201505251947        | `https://testng.org/testng-eclipse-update-site/6.9.5/` | [download](https://testng.org/testng-eclipse-update-site/zipped/6.9.5.201505251947/site_assembly.zip)
 
-(**NOTE**: it's always recommended to install from the ***LATEST RELEASE*** updatesite. the version specific updatesites are for cases that you want to stay on old version.)
+(**NOTE**: it's always recommended to install from the ***LATEST RELEASE*** updatesite. the version-specific updatesites are for cases that you want to stay on an old version.)
 
 ## Change Logs