Revert "Add CircleCI"

.travis.yml

@@ -0,0 +1,9 @@
+language: rust
+rust:
+  - stable
+
+script:
+  - cargo build --verbose
+  - cargo test --verbose
+  - cargo build --verbose --release
+  - cargo test --verbose --release

README.md

@@ -1,5 +1,5 @@
 # md-pdf 
 
-[![CircleCI](https://img.shields.io/circleci/project/github/hoily/md-pdf.svg?style=flat-square)](https://circleci.com/gh/hoily/md-pdf)
+[![Travis](https://img.shields.io/travis/hoily/md-pdf.svg?style=flat-square)](https://travis-ci.org/hoily/md-pdf)
 
 Convert markdown files into PDF Documents.

circle.yml

@@ -1,14 +0,0 @@
-machine:
-    environment:
-        PATH: "$HOME/.cargo/bin:$PATH"
-
-dependencies:
-    pre:
-        - curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain stable -y
-
-test:
-    override:
-        - cargo build 
-        - cargo build --release
-        - cargo test
-        - cargo test --release