Add ChangeLog file, closes #8

ChangeLog.md

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+## Changes between 1.0.0-beta1 and 1.0.0-beta2
+
+### 3-arity of monger.collection/find-one-as-map now takes a vector of fields
+
+3-arity of monger.collection/find-one-as-map now takes a vector of fields
+instead of `keywordize` to better fit a more commonly needed case.
+
+``` clojure
+;; 3-arity in 1.0.0-beta1
+(monger.collection/find-one-as-map "documents" { :first_name "John" } false)
+```
+
+``` clojure
+;; 3-arity in 1.0.0-beta2
+(monger.collection/find-one-as-map "documents" { :first_name "John" } [:first\_name, :last\_name, :age])
+```
+
+
+If you need to use `keywordize`, use 4-arity:
+
+``` clojure
+(monger.collection/find-one-as-map "documents" { :first_name "John" } [:first\_name, :last\_name, :age] false)
+```