added a table of supported versions

[mbannour]

Just I added a table in which reader can found the supported versions by kafka-connect-elasticsearch .

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[mbannour]

[clabot:check]

[ghost]

@confluentinc It looks like @med-ali-bannour just signed our Contributor License Agreement. 👍

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[rhauch]

This is a good thing, and in fact it'd be nice to actually add to the RST documentation as well. Plus, @rayokota has done more testing, so it'd be good to get all of the supported versions (see #169).