Update URL to memory estimates in README (#97)

Author: aggarw13

README.md

@@ -13,7 +13,7 @@ score over 8. This library has also undergone both static code analysis from
 safety and data structure invariance through the
 [CBMC automated reasoning tool](https://www.cprover.org/cbmc/).
 
-See memory requirements for this library [here](https://docs.aws.amazon.com/embedded-csdk/202012.00/lib-ref/libraries/standard/coreHTTP/docs/doxygen/output/html/index.html#http_memory_requirements).
+See memory requirements for this library [here](https://docs.aws.amazon.com/embedded-csdk/202103.00/lib-ref/libraries/standard/coreHTTP/docs/doxygen/output/html/index.html#http_memory_requirements).
 
 **coreHTTP v2.0.0 [source code](https://github.com/FreeRTOS/coreHTTP/tree/v2.0.0/source) is part of the [FreeRTOS 202012.00 LTS](https://github.com/FreeRTOS/FreeRTOS-LTS/tree/202012.00-LTS) release.**