Fix typo

Author: leonard84

README.md

@@ -19,7 +19,7 @@ http://webconsole.spockframework.org.
 Latest Versions
 ---------------
 * The latest 1.x release version is **1.3** (1.3-groovy-2.4, 1.3-groovy-2.5), released on 2019-01-22.
-* The latest 2.0 release version is **2.0-M1** (2.0-M!-groovy-2.5), released on 2019-12-31.
+* The latest 2.0 release version is **2.0-M1** (2.0-M1-groovy-2.5), released on 2019-12-31.
 * The current development version is **2.0-SNAPSHOT** (2.0-groovy-2.5-SNAPSHOT).
 
 **NOTE:** Spock 1.3 is the last release for 1.x based on JUnit 4. Spock 2.0 is based on the JUnit 5 Platform