Update depedencies and use NewSession to generate aws sessions

Due to the way the AWS's pod identity webhook provides authentication
tokens to pods, we need to upgrade `aws-sdk-go` as per
https://docs.aws.amazon.com/eks/latest/userguide/iam-roles-for-service-accounts-minimum-sdk.html
and use replace the deprecated New func with NewSession to properly load the
identity file as detailed in this issue:
kubernetes/autoscaler#2428

collector/aws_ec2.go

@@ -26,8 +26,8 @@ type AWSEC2InstanceGatherer interface {
 // NewAWSEC2Client creates a new AWS EC2 API client
 func NewAWSEC2Client(awsRegion string) (*AWSEC2Client, error) {
 	// Create AWS session
-	s := session.New(&aws.Config{Region: aws.String(awsRegion)})
-	if s == nil {
+	s, err := session.NewSession(&aws.Config{Region: aws.String(awsRegion)})
+	if err != nil {
 		return nil, fmt.Errorf("Error creating AWS session")
 	}
 

collector/aws_logs.go

@@ -28,8 +28,8 @@ type AWSLogsClient struct {
 // NewAWSLogsClient creates a new AWS CloudWatch Logs API client
 func NewAWSLogsClient(awsRegion string, logGroupNamePrefix *string) (*AWSLogsClient, error) {
 	// Create AWS session
-	s := session.New(&aws.Config{Region: aws.String(awsRegion)})
-	if s == nil {
+	s, err := session.NewSession(&aws.Config{Region: aws.String(awsRegion)})
+	if err != nil {
 		return nil, fmt.Errorf("error creating aws session")
 	}
 

go.mod

@@ -1,12 +1,13 @@
 module github.com/kpettijohn/cwlogstream_exporter
 
 require (
-	github.com/aws/aws-sdk-go v1.19.36
-	github.com/prometheus/client_golang v0.9.3
-	github.com/prometheus/common v0.4.1
-	github.com/prometheus/procfs v0.0.0-20190522114515-bc1a522cf7b1 // indirect
-	github.com/sirupsen/logrus v1.2.0
-	github.com/stretchr/testify v1.3.0 // indirect
-	golang.org/x/net v0.0.0-20190522155817-f3200d17e092 // indirect
+	github.com/aws/aws-sdk-go v1.34.12
+	github.com/prometheus/client_golang v1.7.1
+	github.com/prometheus/common v0.13.0
+	github.com/prometheus/tsdb v0.7.1 // indirect
+	github.com/sirupsen/logrus v1.6.0
+	golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a // indirect
+	golang.org/x/sys v0.0.0-20200828161417-c663848e9a16 // indirect
 	golang.org/x/text v0.3.2 // indirect
+	google.golang.org/protobuf v1.25.0 // indirect
 )