updated readme

Author: kellysutton

README.md

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+## Usage
+jquery.typer.js can be used one of two ways:
+
+### Type once with typeTo()
+
+If you just want to use the effect once, use `typeTo()`. It can be used as follows:
+
+    $('h3').typeTo("New Text");
+
+This will do a one-time transition.
+
+### Type indefinitely with typer()
+
+Now let's say you want to loop over a set of strings for the typing effect. Easy!
+
+    $('[data-typer-targets]').typer();
+
+
+That code will start the effect on all elements with the `data-typer-targets` attribute.
+
+You obviously need to supply it with some source data. The `data-typer-targets` attribute can be either a comma-separated string or a piece of JSON.