update readme

.travis.yml

 language: rust
 sudo: false
+addons:
+  apt:
+    packages:
+      - libcurl4-openssl-dev
+      - libelf-dev
+      - libdw-dev
+
+# run builds for both all the trains
 rust:
   - nightly
   - beta
   - stable
+
+# load travis-cargo
+before_script:
+  - |
+      pip install 'travis-cargo<0.2' --user &&
+      export PATH=$HOME/.local/bin:$PATH
+
+# the main build
+script:
+  - |
+      travis-cargo build &&
+      travis-cargo test &&
+      travis-cargo bench &&
+      travis-cargo --only stable doc
+after_success:
+  # upload the documentation from the build with beta (automatically only actually
+  # runs on the master branch)
+  - travis-cargo --only stable doc-upload
+  # measure code coverage and upload to coveralls.io
+  - travis-cargo coveralls --no-sudo
+
+env:
+  global:
+    - secure: "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"
\ No newline at end of file

README.md

@@ -2,7 +2,7 @@
 
 [![crates.io](http://meritbadge.herokuapp.com/coap)](https://crates.io/crates/coap)
 [![Travis Build Status](https://travis-ci.org/Covertness/coap-rs.svg?branch=master)](https://travis-ci.org/Covertness/coap-rs)
-[![Windows Build Status]()](https://ci.appveyor.com/project/Covertness/coap-rs)
+[![Windows Build Status](https://ci.appveyor.com/api/projects/status/ic36jdu4xy6doc59?svg=true)](https://ci.appveyor.com/project/Covertness/coap-rs)
 [![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE)
 
 A [Constrained Application Protocol(CoAP)](https://tools.ietf.org/html/rfc7252) library implemented in Rust.