Relax dependency versions (#45)

* Relax dyn-clone version
* Relax base64 version
* Relax reqwest version

Author: mwilliammyers

elasticsearch/Cargo.toml

@@ -11,10 +11,10 @@ license = "Apache-2.0"
 readme = "../README.md"
 
 [dependencies]
-base64 = "0.11.0"
+base64 = "^0.11"
 bytes = "^0.5"
-dyn-clone = "1.0.1"
-reqwest = { version = "0.10.0", features = ["gzip", "json", "native-tls"] }
+dyn-clone = "~1"
+reqwest = { version = "^0.10", features = ["gzip", "json", "native-tls"] }
 url = "^2.1"
 serde = { version = "~1", features = ["derive"] }
 serde_json = "~1"