[maven-release-plugin] prepare release v1.8.1

Author: kobylynskyi

plugins/maven/graphql-java-codegen-maven-plugin/pom.xml

@@ -4,7 +4,7 @@
  <groupId>io.github.kobylynskyi</groupId>
  <artifactId>graphql-codegen-maven-plugin</artifactId>
  <packaging>maven-plugin</packaging>
- <version>1.8.1-SNAPSHOT</version>
+ <version>1.8.1</version>
 
  <name>graphql-codegen-maven-plugin</name>
  <description>Provides a goal for generating Java code based on GraphQL schema</description>