Fix typo.

Author: Daniel Silva

README.md

@@ -4,13 +4,13 @@
 This library lets you use mathematical intervals in php. Trust me, it's way cooler than it sounds :)
 
 Before using this library you should understand what intervals are and how to use them.
-[MathIsFun](http://www.mathsisfun.com/sets/intervals.html) does an excellent job at expplaining them so thake a look.
+[MathIsFun](http://www.mathsisfun.com/sets/intervals.html) does an excellent job at explaining them so take a look.
 
 ### Interval Notation
-MathInterval uses a different notation to define the intervals. [MathIsFun](http://www.mathsisfun.com/sets/intervals.html) explains that when we intend to exclude the beginning and ending numbers we use ( ).  
+**MathInterval** uses a different notation to define the intervals. [MathIsFun](http://www.mathsisfun.com/sets/intervals.html) explains that when we intend to exclude the beginning and ending numbers we use ( ).  
 For example: ```(5, 12] - Do not include include 5 but include 12.```
 
-In MathInterval we always use [ ] but open them to the opposite side. So the same example would look like: ```]5,12] - Do not include include 5 but include 12.``` If you'd want to also exclude 12 you'd write it as: ```]5,12[ - Do not include include 5 and do not include 12.```
+In MathInterval you always use [ ] but open them to the opposite side. So the same example would look like: ```]5,12] - Do not include include 5 but include 12.``` If you'd want to also exclude 12 you'd write it as: ```]5,12[ - Do not include include 5 and do not include 12.```
 
 > Although MathInterval uses a different notation bot are accepted as part of [ISO 31-11](http://en.wikipedia.org/wiki/ISO_31-11).