Make buffer initialization silently

[r6eve]

In vim 8.1, when executing :IcedConnect, the following interruption occurred.

"iced_temporary" [New File]
Connected.
Press ENTER or type command to continue

It's a little bother, so I suggest making the behavior silently. That is, suppress any interruption.

Connected.

[codecov-io]

Codecov Report

Merging #149 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #149   +/-   ##
=======================================
  Coverage   82.24%   82.24%           
=======================================
  Files          44       44           
  Lines        3576     3576           
=======================================
  Hits         2941     2941           
  Misses        635      635

Impacted Files	Coverage Δ
autoload/iced/nrepl.vim	78.36% <100%> (ø)	⬆️

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[liquidz]

@r6eve Nice catch! Thanks!