Rename or rewrite history of Eharmony

[MattiSG]

Following #42, eharmony was renamed to Eharmony. However, this rename was not reflected in the ID, and was not followed by a history rewrite.

As asked in #42 (comment), it is important to understand if this change was made with the intention to take into account the case-sensitive order of the GitHub UI, or because it corrects the name of the service. If it is the former, it should be reverted. If it is the latter, then the ID should be updated too.

In both cases, the history should be rewritten to unify the names to the final one.