Incorrect link to Interceptor file

[sergey-morenets]

Hi

Main documentation page (http://kong.github.io/unirest-java/#configuration) contains incorrect link to the Interceptor file: https://github.com/Kong/unirest-java/blob/master/unirest/src/main/java/kong/unirest/Interceptor.java

It seems that correct link is: https://github.com/Kong/unirest-java/blob/main/unirest/src/main/java/kong/unirest/core/Interceptor.java

[ryber]

fixed