Update releasing-antlr.md

[maven-release-plugin] copy for tag antlr4-master-4.5.3

[maven-release-plugin] copy for tag 4.5.2

[maven-release-plugin] copy for tag 4.5.1-1

[maven-release-plugin] copy for tag 4.5.1

first beta

[maven-release-plugin] copy for tag 4.5-opt

[maven-release-plugin] copy for tag 4.4.1-opt

ANTLR final release 4.5

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