[readme] Balance the if statement in bash example
Nesting the `elif` at the same level as the `if` and `fi` makes it clear which code applies to which branch (no .nvmrc file / found .nvmrc file). I wasted a while looking at it trying to work out how it did anything if there was a .nvmrc file, because obviously the `if` didn't match and I couldn't see the `elif` branch.
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