Update to get static CRT support from aws-c-common, doc update (aws#121)

* Updated to v0.4.45 of aws-c-common

* doc update for STATIC_CRT

Author: Justin Boswell

README.md

@@ -15,12 +15,15 @@ More protocols and utilities are coming soon, so stay tuned.
 ## Building
 
 The C99 libraries are already included for your convenience as submodules. If you would like to have us build them
-by default, be sure to either perform a recursive clone `git clone --recursive` or initialize the submodules via. 
+by default, be sure to either perform a recursive clone `git clone --recursive` or initialize the submodules via.
 `git submodule update --init`. Then, to build, specify the `-DBUILD_DEPS=ON` CMake argument.
 
 If you want to manage these dependencies manually (e.g. you're using them in other projects), simply specify
 `-DCMAKE_PREFIX_PATH` to point to the absolute path where you have them installed.
 
+### MSVC
+If you want to use a statically linked MSVCRT (/MT, /MTd), you can add `-DSTATIC_CRT=ON` to your cmake configuration.
+
 ## Dependencies?
 
 ### Windows and Apple