[maven-release-plugin] prepare release javapoet-1.4.0
[maven-release-plugin] prepare release javapoet-1.4.0

ponsonio/javapoet,square/kotlinpoet,ponsonio/javapoet,gk5885/javawriter,square/javapoet,square/javawriter,sormuras/javapoet,square/kotlinpoet,gk5885/javawriter,sormuras/javapoet