Tweak GitHub logo (#625)

* Improve GitHub logo (1)

Fix Octocat’s tentacle - not quite thick enough.
Minimal geometry changes made with ‘Yqnn/svg-path-editor’, no change in file size.

* Improve GitHub logo (2)

Correct background colour to better match official brand mark.

* Improve GitHub logo (3)

Re-generate reference PNG image for comparison.

* Improve GitHub logo (4)

Update the Android VectorDrawable.
Edited by hand, with new values from SVG.

README.md

@@ -10,7 +10,7 @@ Say thanks!
 
 ## How Small?
 
-| 542 Bytes SVG | 6,475 Bytes PNG | 414 Bytes SVG | 4,743 Bytes PNG | 250 Bytes SVG | 4,478 Bytes PNG |
+| 542 Bytes SVG | 5,897 Bytes PNG | 414 Bytes SVG | 4,743 Bytes PNG | 250 Bytes SVG | 4,478 Bytes PNG |
 | ------------- | --------------- | ------------- | --------------- | ------------- | --------------- |
 | <img src="https://edent.github.io/SuperTinyIcons/images/svg/github.svg" width="100" /> | <img src="https://edent.github.io/SuperTinyIcons/images/png/github.png" width="100" /> | <img src="https://edent.github.io/SuperTinyIcons/images/svg/twitter.svg" width="100" /> | <img src="https://edent.github.io/SuperTinyIcons/images/png/twitter.png" width="100" /> | <img src="https://edent.github.io/SuperTinyIcons/images/svg/flickr.svg" width="100" /> | <img src="https://edent.github.io/SuperTinyIcons/images/png/flickr.png" width="100" /> |
 

images/android-vector-drawable/github.xml

@@ -5,8 +5,8 @@
     android:viewportHeight="512">
   <path
       android:pathData="M0,0h512v512h-512z"
-      android:fillColor="#1B1817"/>
+      android:fillColor="#181717"/>
   <path
-      android:pathData="M335,499c14,0 12,17 12,17H165s-2,-17 12,-17c13,0 16,-6 16,-12l-1,-50c-71,16 -86,-28 -86,-28 -12,-30 -28,-37 -28,-37 -24,-16 1,-16 1,-16 26,2 40,26 40,26 22,39 59,28 74,22 2,-17 9,-28 16,-35 -57,-6 -116,-28 -116,-126 0,-28 10,-51 26,-69 -3,-6 -11,-32 3,-67 0,0 21,-7 70,26 42,-12 86,-12 128,0 49,-33 70,-26 70,-26 14,35 6,61 3,67 16,18 26,41 26,69 0,98 -60,120 -117,126 10,8 18,24 18,48l-1,70c0,6 3,12 16,12z"
+      android:pathData="M335,499c14,0 12,17 12,17H165s-2,-17 12,-17c13,0 16,-6 16,-12l-1,-44c-71,16 -86,-34 -86,-34 -12,-30 -28,-37 -28,-37 -24,-16 1,-16 1,-16 26,2 40,26 40,26 22,39 59,28 74,22 2,-17 9,-28 16,-35 -57,-6 -116,-28 -116,-126 0,-28 10,-51 26,-69 -3,-6 -11,-32 3,-67 0,0 21,-7 70,26 42,-12 86,-12 128,0 49,-33 70,-26 70,-26 14,35 6,61 3,67 16,18 26,41 26,69 0,98 -60,120 -117,126 10,8 18,24 18,48l-1,70c0,6 3,12 16,12z"
       android:fillColor="#fff"/>
 </vector>

images/svg/github.svg

@@ -3,4 +3,4 @@ aria-label="GitHub" role="img"
 viewBox="0 0 512 512"><rect
 width="512" height="512"
 rx="15%"
-fill="#1B1817"/><path fill="#fff" d="M335 499c14 0 12 17 12 17H165s-2-17 12-17c13 0 16-6 16-12l-1-50c-71 16-86-28-86-28-12-30-28-37-28-37-24-16 1-16 1-16 26 2 40 26 40 26 22 39 59 28 74 22 2-17 9-28 16-35-57-6-116-28-116-126 0-28 10-51 26-69-3-6-11-32 3-67 0 0 21-7 70 26 42-12 86-12 128 0 49-33 70-26 70-26 14 35 6 61 3 67 16 18 26 41 26 69 0 98-60 120-117 126 10 8 18 24 18 48l-1 70c0 6 3 12 16 12z"/></svg>
+fill="#181717"/><path fill="#fff" d="M335 499c14 0 12 17 12 17H165s-2-17 12-17c13 0 16-6 16-12l-1-44c-71 16-86-34-86-34-12-30-28-37-28-37-24-16 1-16 1-16 26 2 40 26 40 26 22 39 59 28 74 22 2-17 9-28 16-35-57-6-116-28-116-126 0-28 10-51 26-69-3-6-11-32 3-67 0 0 21-7 70 26 42-12 86-12 128 0 49-33 70-26 70-26 14 35 6 61 3 67 16 18 26 41 26 69 0 98-60 120-117 126 10 8 18 24 18 48l-1 70c0 6 3 12 16 12z"/></svg>