Add TravisCI integration

.travis.yml

@@ -0,0 +1,4 @@
+language: rust
+rust:
+  - stable
+  - beta

README.md

@@ -1,6 +1,8 @@
 # tcalc
 A featureful calculator for when you want to do math in a terminal.
 
+[![Build Status](https://travis-ci.org/dubrowgn/tcalc.svg?branch=master)](https://travis-ci.org/dubrowgn/tcalc)
+
 ## Usage
 tcalc supports two modes of usage: terminal and REPL.
 

src/main.rs

@@ -73,7 +73,7 @@ fn repl() {
 	loop {
 		match rl.readline("> ") {
 			Ok(line) => {
-				rl.add_history_entry(&line);
+				rl.add_history_entry(line.as_str());
 				match parsing::parse(&line) {
 					Some(Ast::Command(Command::Exit)) => break,
 					Some(Ast::Expression(expr)) => {