Add white outline stroke to logo.png (#4003)

* Add white outline stroke to logo.png

* Add Peter Murphy to CONTRIBUTORS.md

* Move logo change to correct CHANGELOG section

Co-authored-by: Harry Garrood <harry@garrood.me>

CHANGELOG.md

@@ -14,6 +14,10 @@ Bugfixes:
 
 Other improvements:
 
+* Add white outline stroke to logo in README (#4003, @ptrfrncsmrph)
+
+  The previous `logo.png` was not legible against a dark background (#4001).
+
 ## v0.14.0
 
 ### Polykinds
@@ -298,6 +302,7 @@ We are going to output ES modules instead of CommonJS in the next breaking relea
 
 * More descriptive protocol errors from the ide server (@kritzcreek)
 
+
 ## [v0.13.8](https://github.com/purescript/purescript/releases/tag/v0.13.8) - 2020-05-23
 
 **Bug Fixes**

CONTRIBUTORS.md

@@ -97,6 +97,7 @@ If you would prefer to use different terms, please use the section below instead
 | [@phiggins](https://github.com/phiggins) | Pete Higgins | [MIT license](http://opensource.org/licenses/MIT) |
 | [@philopon](https://github.com/philopon) | Hirotomo Moriwaki | [MIT license](http://opensource.org/licenses/MIT) |
 | [@pseudonom](https://github.com/pseudonom) | Eric Easley | [MIT license](http://opensource.org/licenses/MIT) |
+| [@ptrfrncsmrph](https://github.com/ptrfrncsmrph) | Peter Murphy | [MIT license](http://opensource.org/licenses/MIT) |
 | [@quesebifurcan](https://github.com/quesebifurcan) | Fredrik Wallberg | [MIT license](http://opensource.org/licenses/MIT) |
 | [@rhendric](https://github.com/rhendric) | Ryan Hendrickson | [MIT license](http://opensource.org/licenses/MIT) |
 | [@rightfold](https://github.com/rightfold) | rightfold | [MIT license](https://opensource.org/licenses/MIT) |

README.md

@@ -1,4 +1,4 @@
-[![PureScript](logo.png)](http://purescript.org)
+<img src="logo.png" alt="PureScript" width="392">
 
 A small strongly typed programming language with expressive types that compiles to JavaScript, written in and inspired by Haskell.