Update README.md

Author: albertus82

README.md

@@ -22,7 +22,7 @@ Download the [latest release](https://github.com/albertus82/earthquake-bulletin/
   ![Windows protected your PC](https://user-images.githubusercontent.com/8672431/31048995-7145b034-a62a-11e7-860b-c477237145ce.png)
 
   In order to enable the *Run anyway* button, you may need to open the *Properties* of the installer, tab *General*, section *Security* (if available), and tick the ***Unblock*** option.
-  > This workaround is required because the installer executables are not *signed*, and there are no free certificates I can use to sign them.
+  > This workaround is required because the installer executables are not *signed*, as there are no free certificates I can use to sign them.
 * **Linux** & **macOS**: unpack the archive.
 
 **This application requires [Java SE Runtime Environment (JRE)](https://www.java.com) v1.8 (or newer) to run.**