Merge branch 'master' into patch-1

Author: jaychsu

README.md

@@ -22,6 +22,7 @@ The challenges for algorithm contests, and summary the implementation.
 | lintcode | for [LintCode](http://www.lintcode.com) |
 | pramp | for [Pramp](https://www.pramp.com) |
 | topcoder | for [ActiveContests](https://community.topcoder.com/longcontest/?module=ViewActiveContests), [Practices](https://community.topcoder.com/longcontest/?module=ViewPractice), and [ProblemArchives](https://community.topcoder.com/tc?module=ProblemArchive) in [Topcoder](https://www.topcoder.com) |
+| Scaler | for [Scaler Topics](https://www.scaler.com/topics/) |
 | InterviewBit | for [Technical Interview](https://www.interviewbit.com/technical-interview-questions/), [Data Structures and Algorithms](https://www.interviewbit.com/courses/programming/), [Contests](https://www.interviewbit.com/contests/), and [Mock Interviews](https://www.interviewbit.com/mock-interview/) |
 
 ## Testing