Adding aws-c-event-stream and aws-checksums submodules (#195)

* Adding aws-c-event-stream and aws-checksums submodules

* Changing submodule references to HTTPS instead of SSH.

Author: DavidOgunsAWS

.gitmodules

@@ -22,3 +22,9 @@
 [submodule "aws-common-runtime/aws-c-auth"]
 	path = crt/aws-c-auth
 	url = https://github.com/awslabs/aws-c-auth.git
+[submodule "crt/aws-c-event-stream"]
+	path = crt/aws-c-event-stream
+	url = https://github.com/awslabs/aws-c-event-stream.git
+[submodule "crt/aws-checksums"]
+	path = crt/aws-checksums
+	url = https://github.com/awslabs/aws-checksums.git

crt/aws-c-event-stream

@@ -138,7 +138,9 @@ def __init__(self, name, extra_cmake_args=[]):
 AWS_LIBS.append(AwsLib('aws-c-common'))
 AWS_LIBS.append(AwsLib('aws-c-io'))
 AWS_LIBS.append(AwsLib('aws-c-cal'))
+AWS_LIBS.append(AwsLib('aws-checksums'))
 AWS_LIBS.append(AwsLib('aws-c-compression'))
+AWS_LIBS.append(AwsLib('aws-c-event-stream'))
 AWS_LIBS.append(AwsLib('aws-c-http'))
 AWS_LIBS.append(AwsLib('aws-c-auth'))
 AWS_LIBS.append(AwsLib('aws-c-mqtt'))