Fix print_info_message <Esc> issue

I ran into an issue when first using this plugin where the
print_info_message function wasn't working correctly due to vim
misinterpreting the <Esc> sequence in `vim.command("normal \\<Esc>")` as
a series of individual characters rather than a single literal Escape
character. This resulted in the characters 'c>' being inserted into the
active buffer at the cursor location because the 's' in '<Esc>' was
being interpreted as a normal mode 's', causing it to enter insert mode,
and none of the info messages were being echoed properly. This was
frustrating as it was not easy to figure out why my commands weren't
working initially (turns out I hadn't configured my billing plan
correctly, d'oh).

Fix this by using a more robust way of sending the <Esc> character to
vim via `vim.command('call feedkeys("\<Esc>")')`.

The usage of double quotes inside the feedkeys() call is important
because it causes vim to treat the sequence as a proper escape sequence
rather than a series of individual characters (see :h feedkeys).

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