Version bump to 0.7.0

Cargo.lock

 [root]
 name = "exa"
-version = "0.6.0"
+version = "0.7.0"
 dependencies = [
  "ansi_term 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "datetime 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",

Cargo.toml

 [package]
 name = "exa"
-version = "0.6.0"
+version = "0.7.0"
 authors = [ "ogham@bsago.me" ]
 
 [[bin]]

contrib/man/exa.1

 .hy
-.TH "exa" "1" "2017\-05\-17" "exa 0.6.0" ""
+.TH "exa" "1" "2017\-07\-07" "exa 0.7.0" ""
 .SH NAME
 .PP
 exa \- a modern replacement for ls