Inconsistent icon size

[zypA13510]

Icon size of logos (logo-github, logo-gist) is inconsistent.

Although in v1.0.0 generated using node engine of grunt-webfont, they are consistent, but it was too small. Using mega-size and they are still barely visible (the screenshot was enlarged 2x).

On a side note, the official webfont back at v4.4.0 had exactly the same issue:

<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/gh/primer/[email protected]/build/font/octicons.min.css">
<i class="mega-octicon octicon-logo-github"></i>
<i class="mega-octicon octicon-logo-gist"></i>
<i class="octicon octicon-markdown"></i>
<i class="octicon octicon-octoface"></i>
<i class="octicon octicon-paintcan"></i>