updated readme, t1.micro dep, no need to provide specific regions
updated readme, t1.micro dep, no need to provide specific regions

mozimos/newrelic_aws_cloudwatch_plugin,botlink/newrelic_aws_cloudwatch_plugin,Yuji-Yamamoto-Recruit/newrelic_aws_cloudwatch_plugin,airbnb/newrelic_aws_cloudwatch_plugin,buluma/newrelic_aws_cloudwatch_plugin