updated Readme

Author: Amit Upadhyay

README.md

@@ -4,27 +4,23 @@ Time everything in IPython
 ## Installation:
 
 ```
-%install_ext https://raw.github.com/cpcloud/ipython-autotime/master/autotime.py
+$ pip install ipython-autotime
 ```
 
 ## Examples
 
 ```python
-In [1]: %install_ext https://raw.github.com/cpcloud/ipython-autotime/master/autotime.py
-Installed autotime.py. To use it, type:
-  %load_ext autotime
-
-In [2]: %load_ext autotime
+In [1]: %load_ext autotime
 time: 1433692.87 s
 
-In [3]: x = 1
+In [2]: x = 1
 time: 730.99 us
 
-In [4]: x + 2
-Out[4]: 3
+In [3]: x + 2
+Out[3]: 3
 time: 2.50 ms
 
-In [5]: x + ''
+In [4]: x + ''
 ---------------------------------------------------------------------------
 TypeError                                 Traceback (most recent call last)
 <ipython-input-5-bde712cacec5> in <module>()