Use pre instead of pre-line for code whitespace. (SwiftDocOrg#144)

* Use pre instead of pre-line for code whitespace.

* Add changelog entry for SwiftDocOrg#144

Co-authored-by: Mattt <[email protected]>

Author: mbrandonw

Assets/css/all.css

@@ -887,7 +887,7 @@ dd {
   padding: 1em;
   padding-left: 3em;
   text-indent: -2em;
-  white-space: pre-line;
+  white-space: pre;
 
   & .p {
     white-space: nowrap;

Changelog.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Fixed runtime error related to networking and processes on Ubuntu Linux.
   #140 by @JaapWijnen.
+- Fixed whitespace of code listings.
+  #144 by @mbrandonw.
 
 ## [1.0.0-beta.3] - 2020-05-19