Pin exactly futures-0.2.0-beta.

Tokio does not support stable futures 2 yet

Cargo.toml

@@ -1,17 +1,17 @@
 [package]
 name = "tokio-zmq"
 description = "Provides Futures abstractions for ZeroMQ on the Tokio event-loop"
-version = "0.4.0-beta2"
+version = "0.4.0-beta3"
 license = "GPL-3.0"
 authors = ["Riley Trautman <[email protected]>"]
 repository = "https://github.com/asonix/tokio-zmq"
 readme = "README.md"
 keywords = ["zmq", "zeromq", "futures", "tokio"]
 
 [dependencies]
-futures-core = "0.2.0-beta"
-futures-sink = "0.2.0-beta"
-futures-util = "0.2.0-beta"
+futures-core = "=0.2.0-beta"
+futures-sink = "=0.2.0-beta"
+futures-util = "=0.2.0-beta"
 log = "0.4"
 mio = "0.6"
 tokio-file-unix = "0.5"
@@ -29,7 +29,7 @@ features = [ "unstable-futures" ]
 
 [dev-dependencies]
 env_logger = "0.4"
-futures-channel = "0.2.0-beta"
+futures-channel = "=0.2.0-beta"
 
 [dev-dependencies.tokio]
 version = "0.1"

README.md

@@ -23,11 +23,13 @@ See the [examples folder](https://github.com/asonix/zmq-futures/tree/master/exam
 
 ### Getting Started
 
-Add the following to your Cargo.toml
+Add the following to your Cargo.toml (As of the futures 0.2.0 stable release, Tokio does not support
+futures2. It does have support for futures 0.2.0-beta, so pinning that version of futures is
+important)
 ```toml
 zmq = "0.8"
-tokio-zmq = "0.4.0-beta2"
-futures = "0.2.0-beta"
+tokio-zmq = "0.4.0-beta3"
+futures = "=0.2.0-beta"
 tokio = "0.1"
 ```