Update pattern: emaillocalpart (#614)

Merge after `1.6.3` release

Author: LaurenceJJones

crowdsec-docs/docs/parsers/patterns-documentation.md

@@ -666,7 +666,7 @@ Pattern :
 
 Pattern :
 ```
-[a-zA-Z][a-zA-Z0-9_.+-=:]+
+[a-zA-Z0-9_.+-=:]+
 ```
 
 ## URIPATHPARAM