[RELEASE] Released version 1.8-dev0

Released version 1.8-dev0 with the following main changes :
    - exact copy of 1.7.0
diff --git a/README b/README
index de139ff..562503c 100644
--- a/README
+++ b/README
@@ -1,7 +1,7 @@
                          ----------------------
                              HAProxy how-to
                          ----------------------
-                              version 1.7
+                              version 1.8
                              willy tarreau
                                2016/11/25