Update readme.md

On line 55 of readme file it was written "igher" in place of "higher" so I have corrected the mistake and committed the changes.

Author: SDprogramer

readme.md

@@ -52,7 +52,7 @@ Stack overflow is a professional community for developers, Stackoverflow conduct
 
 1. To perform Analysis on 3 years Stackoverflow Dataset and get insights.
 2. To perform Data Analysis and answer the below questions.
-   + Impact of igher education on salary of the surveyed developers.
+   + Impact of higher education on salary of the surveyed developers.
    + Impact of education/experience/responsibilities on gender inequalities.
    + Impact on participation rate due to different ethnicity.
    + To find whether there is any difference between men and women's income.