fix: spacing in warnForWrongBranch()

[codebytere]

Fixes a teeny spacing issue in warnForWrongBranch() when running release prep:

Before:

node on git:v14.x-staging ❯ g node release --prepare                           8:33PM
   ⚠  You are trying to create a new release proposal branch for v15, but you're checked out on v14.x-staging and not v15.x-staging.
--------------------------------------------------------------------------------
   ℹ  Switch to `v15.x-staging` with `gitcheckout v15.x-staging` before proceeding.
--------------------------------------------------------------------------------

After:

node on git:v14.x-staging ❯ g node release --prepare                           8:34PM
   ⚠  You are trying to create a new release proposal branch for v15, but you're checked out on v14.x-staging and not v15.x-staging.
--------------------------------------------------------------------------------
   ℹ  Switch to `v15.x-staging` with `git checkout v15.x-staging` before proceeding.
--------------------------------------------------------------------------------

cc @targos @BridgeAR

[codecov]

Codecov Report

Merging #448 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #448   +/-   ##
=======================================
  Coverage   77.08%   77.08%           
=======================================
  Files          21       21           
  Lines        1497     1497           
=======================================
  Hits         1154     1154           
  Misses        343      343           

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