MB-100 Remove reference to libei in README

Change-Id: I139a7cac313aa232350af2e644839bdd9459b3c2
Reviewed-on: http://review.couchbase.org/19684
Reviewed-by: Jens Alfke <jens@couchbase.com>
Tested-by: Jens Alfke <jens@couchbase.com>

README.md

@@ -1,8 +1,7 @@
 # Couchbase (.couch) storage file C library
 
 ## Dependencies:
-
- * libei, from the `erl_interface` OTP library. Will be detected if erlang is installed.
+
  * snappy.
  * Lua interpreter, to run the test suite