Prepare for publishing.

Specify version of `frequency` dependency.

btreemap/Cargo.toml

@@ -14,4 +14,5 @@ categories = ["algorithms"]
 num-traits = "0.1.37"
 
 [dependencies.frequency]
+version = "^1.0.0"
 path = "../"
\ No newline at end of file

hashmap/Cargo.toml

@@ -15,4 +15,5 @@ fnv = "^1.0"
 num-traits = "0.1.37"
 
 [dependencies.frequency]
+version = "^1.0.0"
 path = "../"
\ No newline at end of file

ordermap/Cargo.toml

@@ -16,4 +16,5 @@ ordermap = "0.2.8"
 num-traits = "0.1.37"
 
 [dependencies.frequency]
+version = "^1.0.0"
 path = "../"
\ No newline at end of file