[vala-extra-vapis] Change README to Markdown format and update Upstream Guide link

[Rico Tzschichholz <ricotz src gnome org>]

commit 2031a85c5b71e00439c30d83efa5addb11f7602e
Author: Alistair Thomas <astavale yahoo co uk>
Date:   Mon Apr 16 11:12:54 2018 +0100

    Change README to Markdown format and update Upstream Guide link

 README => README.md | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)
---
diff --git a/README b/README.md
similarity index 80%
rename from README
rename to README.md
index ee8e869..d0b922e 100644
--- a/README
+++ b/README.md
@@ -2,15 +2,16 @@ This repository provides Vala bindings to various libraries which do
 not provide their own bindings, and for which valac does not provide
 bindings.
 
-== Rationale ==
+## Rationale
 
 In most cases it is preferable for libraries to ship their own
 bindings (some of the reasons why, as well as information on how to do
-so, are at http://live.gnome.org/Vala/UpstreamGuide).  Some libraries,
-however, are unable or unwilling to do so.  Other bindings are
-distributed with valac, but generally that is reserved for relatively
-popular libraries with well structured VAPIs and have a fairly strong
-aversion to breaking backwards compatibility.
+so, are at Vala Binding's
+[Upstream Guide](https://wiki.gnome.org/Projects/Vala/UpstreamGuide).
+Some libraries, however, are unable or unwilling to do so. Other
+bindings are distributed with valac, but generally that is reserved
+for relatively popular libraries with well structured VAPIs and have
+a fairly strong aversion to breaking backwards compatibility.
 
 Bindings included in this repository are meant to be copied into your
 project or used as a git submodule or subtree, and are *not* intended
@@ -28,7 +29,7 @@ bindings, preserving backwards compatibility, testing, etc.  With that
 in mind, this repository provides a good stable, central location for
 bindings.
 
-== Usage ==
+## Usage
 
 Because the bindings shipped in this repository provide no
 backwards-compatibility promises, it is designed to be used as a git
@@ -36,7 +37,7 @@ submodule.  If that is not acceptable (for example, if you don't use
 git), it is recommended you simply copy the bindings you need into
 your source tree.
 
-== Submitting Bindings For Inclusion ==
+## Submitting Bindings For Inclusion
 
 If you have bindings which you would like to see housed in this
 repository, simply submit a bug to the "Bindings: Extra" component in