Broken link in Single Responsibility Principle section

[mtfurlan]

In the Single Responsibility Principle section, the first link to
https://en.wikipedia.org/wiki/Single_responsibility_principle
is broken, and points instead to
https://angular.io/docs/ts/latest/guide/%5C/%5C/en.wikipedia.org/wiki/Single_responsibility_principle

[johnpapa]

please make a PR and get your name on the contributions list :)