Fixed minor typo retrievs, retrieves (#127)

Author: Kevin-Mattheus-Moerman

README.md

@@ -309,7 +309,7 @@ xx, yy = mxcall(:meshgrid, 2, x, y)
 ```
 *Note:* Since MATLAB functions behavior depends on the number of outputs, you have to specify the number of output arguments in ``mxcall`` as the second argument.
 
-``mxcall`` puts the input arguments to the MATLAB workspace (using mangled names), evaluates the function call in MATLAB, and retrievs the variable from the MATLAB session. This function is mainly provided for convenience. However, you should keep in mind that it may incur considerable overhead due to the communication between MATLAB and Julia domain.
+``mxcall`` puts the input arguments to the MATLAB workspace (using mangled names), evaluates the function call in MATLAB, and retrieves the variable from the MATLAB session. This function is mainly provided for convenience. However, you should keep in mind that it may incur considerable overhead due to the communication between MATLAB and Julia domain.
 
 #### Viewing the MATLAB Session (Windows only)