Update URL to memory estimates in README (#154)

Author: aggarw13

README.md

@@ -4,7 +4,7 @@ This repository contains the coreMQTT library that has been optimized for a low
 
 This library has gone through code quality checks including verification that no function has a [GNU Complexity](https://www.gnu.org/software/complexity/manual/complexity.html) score over 8, and checks against deviations from mandatory rules in the [MISRA coding standard](https://www.misra.org.uk/MISRAHome/MISRAC2012/tabid/196/Default.aspx).  Deviations from the MISRA C:2012 guidelines are documented under [MISRA Deviations](MISRA.md). This library has also undergone both static code analysis from [Coverity static analysis](https://scan.coverity.com/), and validation of memory safety and proof of functional correctness 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/coreMQTT/docs/doxygen/output/html/index.html#mqtt_memory_requirements).
+See memory requirements for this library [here](https://docs.aws.amazon.com/embedded-csdk/202103.00/lib-ref/libraries/standard/coreMQTT/docs/doxygen/output/html/index.html#mqtt_memory_requirements).
 
 **coreMQTT v1.1.0 [source code](https://github.com/FreeRTOS/coreMQTT/tree/v1.1.0/source) is part of the [FreeRTOS 202012.00 LTS](https://github.com/FreeRTOS/FreeRTOS-LTS/tree/202012.00-LTS) release.**