update r3 package, add detail install step

lucemia · lucemia · commit 8e692353394d · 2014-06-09T11:23:17.000+08:00
diff --git a/README.md b/README.md
@@ -24,5 +24,9 @@ print r.match('/foo/bar')
     git clone https://github.com/lucemia/pyr3
     git submodule init
     git submodule update
-    python setup.py build
+    cd ./r3
+    ./autogen.sh
+    ./configure
+    cd ..
+    python setup.py build_ext --inplace
 
diff --git a/r3 b/r3
@@ -1 +1 @@
-Subproject commit 8e3a35b06f6057cf18a53cca849735c5a4ba525a
+Subproject commit 4180b30be3daf1d61a0fd10c67f8811e672a6965
