Replace http urls with https where supported

Author: josdejong

CONTRIBUTING.md

@@ -6,7 +6,7 @@ ideas and suggestions, and contribute to the code.
 
 There are a few preferences regarding code contributions:
 
-- The code of math.js follows the JavaScript Standard Style as described on http://standardjs.com/.
+- The code of math.js follows the JavaScript Standard Style as described on https://standardjs.com/.
 - Make sure you properly unit test your changes.
 - Before creating a pull request, run the unit tests to make sure they all pass.
 - Only commit changes done in the source files under `src`, not to the generated builds
@@ -15,9 +15,9 @@ There are a few preferences regarding code contributions:
 
 What can I do?
 
-- Search through the [issues](https://github.com/josdejong/mathjs/issues) looking 
-  for something that looks interesting to you to pick up. Some issues are marked 
-  ["help wanted"](https://github.com/josdejong/mathjs/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22), 
+- Search through the [issues](https://github.com/josdejong/mathjs/issues) looking
+  for something that looks interesting to you to pick up. Some issues are marked
+  ["help wanted"](https://github.com/josdejong/mathjs/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22),
   these are typically issues which should be relatively easy to pick up.
 
 Thanks!

LICENSE

@@ -1,6 +1,6 @@
                                Apache License
                            Version 2.0, January 2004
-                        http://www.apache.org/licenses/
+                        https://www.apache.org/licenses/
 
    TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION