Fix typos in README and CONTRIBUTING.

CONTRIBUTING.md

@@ -10,7 +10,7 @@ The main branch for development is `develop`. This is on top of this branch
 that you must write your patches.
 
 Any pull request built on top of `master` instead of `develop`
-is additionnal merge work for maintainers, and you want to avoid this if you
+is additional merge work for maintainers, and you want to avoid this if you
 aim for quick integration of your work.
 
 If you wrote your patch on the wrong branch the maintainers may choose to close
@@ -41,7 +41,7 @@ How to do the right thing?
 
     # Check that your local repo is up to date
     $ git fetch
-    # Rebase your work on the lastest state of `develop`
+    # Rebase your work on the latest state of `develop`
     $ git rebase upstream/develop
 
     # Push

README.md

@@ -92,7 +92,7 @@ git clone https://github.com/nojhan/liquidprompt.git
 source liquidprompt/liquidprompt
 ```
 
-To use it everytime you start a shell add the following line to your
+To use it every time you start a shell add the following line to your
 `.bashrc` (if you use bash) or `.zshrc` (if you use zsh):
 
 `source ~/liquidprompt/liquidprompt`
@@ -342,11 +342,11 @@ version 3.
 * Browsing into very large subversion repositories may dramatically slow down
 the display of the liquid prompt (use `LP_DISABLED_VCS_PATH` to avoid that).
 * Subversion repository cannot display commits to be pushed, this is a
-limitation of the Subversion versionning model.
+limitation of the Subversion versioning model.
 * The proxy detection only uses the `$http_proxy` environment variable.
 * The window's title escape sequence may not work properly on some terminals
 (like xterm-256)
-* The analog clock necessitate a unicode-aware terminal and a at least one
+* The analog clock necessitate a Unicode-aware terminal and a at least one
 sufficiently complete font on your system.
 The [Symbola](http://users.teilar.gr/~g1951d/) font, designed by Georges Douros,
 is known to work well.