Update Source Serif Pro fonts to version 2.010

Pulled in from https://github.com/adobe-fonts/source-serif-pro/

See https://bugzilla.mozilla.org/show_bug.cgi?id=1545317

Author: Manishearth

src/librustdoc/html/render.rs

@@ -930,7 +930,7 @@ themePicker.onblur = handleThemeButtonsBlur;
           static_files::source_serif_pro::BOLD)?;
     write(cx.dst.join("SourceSerifPro-It.ttf.woff"),
           static_files::source_serif_pro::ITALIC)?;
-    write(cx.dst.join("SourceSerifPro-LICENSE.txt"),
+    write(cx.dst.join("SourceSerifPro-LICENSE.md"),
           static_files::source_serif_pro::LICENSE)?;
     write(cx.dst.join("SourceCodePro-Regular.woff"),
           static_files::source_code_pro::REGULAR)?;

src/librustdoc/html/static/SourceSerifPro-Bold.ttf.woff

@@ -1,4 +1,4 @@
-Copyright 2014 Adobe Systems Incorporated (http://www.adobe.com/), with Reserved Font Name 'Source'. All Rights Reserved. Source is a trademark of Adobe Systems Incorporated in the United States and/or other countries.
+Copyright 2014-2018 Adobe (http://www.adobe.com/), with Reserved Font Name 'Source'. All Rights Reserved. Source is a trademark of Adobe in the United States and/or other countries.
 
 This Font Software is licensed under the SIL Open Font License, Version 1.1.
 

src/librustdoc/html/static/SourceSerifPro-It.ttf.woff

@@ -91,7 +91,7 @@ pub mod source_serif_pro {
     pub static ITALIC: &'static [u8] = include_bytes!("static/SourceSerifPro-It.ttf.woff");
 
     /// The file `SourceSerifPro-LICENSE.txt`, the license text for the Source Serif Pro font.
-    pub static LICENSE: &'static [u8] = include_bytes!("static/SourceSerifPro-LICENSE.txt");
+    pub static LICENSE: &'static [u8] = include_bytes!("static/SourceSerifPro-LICENSE.md");
 }
 
 /// Files related to the Source Code Pro font.