Fix completion for R5RS Scheme.
See https://github.com/ashinn/scheme-complete/issues/1

--- scheme-complete-master/scheme-complete.el.orig	2015-12-25 21:59:09.896909029 +0100
+++ scheme-complete-master/scheme-complete.el	2015-12-25 21:59:17.924993998 +0100
@@ -591,7 +591,7 @@
            '((exact->inexact (lambda (z) z))
              (inexact->exact (lambda (z) z)))
            (mapcar #'(lambda (x)
-                       (list x (scheme-env-lookup *scheme-r7rs-info* x)))
+                       (scheme-env-lookup *scheme-r7rs-info* x))
                    *scheme-r5rs-bindings*))))
   *scheme-r5rs-info*)