updated contents page

README.md

@@ -11,14 +11,15 @@ This material covers the design of RESTful APIs and the use of NodeJS to build,
 2. [Javascript Objects](02%20JavaScript%20Objects.md)
 3. [Asynchronous JavaScript](03%20Asynchronous%20JavaScript.md)
 4. [Writing Robust Code](04%20Writing%20Robust%20Code.md)
-5. [Unit Testing](05%20Unit%20Testing.md)
-6. [Data Persistence](06%20Data%20Persistence.md)
+5. [Version Control](05%20Version%20Control.md)
+6. [Writing Robust Code](06%20Unit%20RTesting.md)
+6. [Data Persistence](07%20Data%20Persistence.md)
 
 ## Part 2: APIs
 
-1. [Understanding APIs](07%20Understanding%20APIs.md)
-2. [Building APIs](08%20Building%20APIs.md)
-3. [Acceptance Testing](09%20Acceptance%20Testing.md)
-4. [API Security](10%20API%20Security.md)
-5. [Advanced API Design](11%20Advanced%20API%20Design.md)
-6. [Docker](12%20Docker.md)
+1. [Understanding APIs](08%20Understanding%20APIs.md)
+2. [Building APIs](09%20Building%20APIs.md)
+3. [Acceptance Testing](10%20Acceptance%20Testing.md)
+4. [API Security](11%20API%20Security.md)
+5. [Advanced API Design](12%20Advanced%20API%20Design.md)
+6. [Docker](13%20Docker.md)