Relax semver specs

cc rust-lang/rust#41639

Author: jwilm

Cargo.lock

@@ -1,7 +1,7 @@
 [package]
 
 name = "racer"
-version = "2.0.6"
+version = "2.0.7"
 license = "MIT"
 description = "Code completion for Rust"
 authors = ["Phil Dawes <[email protected]>"]
@@ -21,13 +21,13 @@ doc = false
 debug = true
 
 [dependencies]
-log = "~0.3.6"
-syntex_syntax = "~0.52.0"
-syntex_errors = "~0.52.0"
-toml = "~0.2.1"
-env_logger = "~0.3.4"
-typed-arena = "~1.2.0"
-clap = "~2.19.0"
+log = "0.3.6"
+syntex_syntax = "0.52.0"
+syntex_errors = "0.52.0"
+toml = "0.2.1"
+env_logger = "0.3.4"
+typed-arena = "1.2"
+clap = "2.19"
 
 [dependencies.clippy]
 version = "0.0.103"