feat(lambda): add py3.7 runtime support

[hanks]

Changes proposed in this pull request:

• Add lambda function runtime 3.7 support

Output from acceptance testing:

2018/11/26 17:41:42 Start to execute command: [make testacc TESTARGS=-run=TestAccAWSLambdaFunction_runtimeValidation_python37]
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./... -v -parallel 20 -run=TestAccAWSLambdaFunction_runtimeValidation_python37 -timeout 120m
?   	github.com/terraform-providers/terraform-provider-aws	[no test files]
=== RUN   TestAccAWSLambdaFunction_runtimeValidation_python37
=== PAUSE TestAccAWSLambdaFunction_runtimeValidation_python37
=== CONT  TestAccAWSLambdaFunction_runtimeValidation_python37
--- PASS: TestAccAWSLambdaFunction_runtimeValidation_python37 (50.83s)
PASS

[balassit]

Fixes #6620

[bflad]

LGTM, thanks @hanks! 🚀

--- PASS: TestAccAWSLambdaFunction_expectFilenameAndS3Attributes (22.49s)
--- PASS: TestAccAWSLambdaFunction_importLocalFile_VPC (30.87s)
--- PASS: TestAccAWSLambdaFunction_basic (31.46s)
--- PASS: TestAccAWSLambdaFunction_importS3 (32.15s)
--- PASS: TestAccAWSLambdaFunction_versioned (34.61s)
--- PASS: TestAccAWSLambdaFunction_VPC (34.98s)
--- PASS: TestAccAWSLambdaFunction_EmptyVpcConfig (23.76s)
--- PASS: TestAccAWSLambdaFunction_importLocalFile (46.22s)
--- PASS: TestAccAWSLambdaFunction_runtimeValidation_noRuntime (1.47s)
--- PASS: TestAccAWSLambdaFunction_s3 (20.20s)
--- PASS: TestAccAWSLambdaFunction_DeadLetterConfig (53.86s)
--- PASS: TestAccAWSLambdaFunction_updateRuntime (56.52s)
--- PASS: TestAccAWSLambdaFunction_localUpdate_nameOnly (30.11s)
--- PASS: TestAccAWSLambdaFunction_s3Update_basic (29.06s)
--- PASS: TestAccAWSLambdaFunction_VPCRemoval (64.43s)
--- PASS: TestAccAWSLambdaFunction_VPCUpdate (67.96s)
--- PASS: TestAccAWSLambdaFunction_s3Update_unversioned (34.06s)
--- PASS: TestAccAWSLambdaFunction_localUpdate (37.81s)
--- PASS: TestAccAWSLambdaFunction_DeadLetterConfigUpdated (71.40s)
--- PASS: TestAccAWSLambdaFunction_versionedUpdate (73.97s)
--- PASS: TestAccAWSLambdaFunction_nilDeadLetterConfig (75.85s)
--- PASS: TestAccAWSLambdaFunction_runtimeValidation_python27 (28.33s)
--- PASS: TestAccAWSLambdaFunction_concurrency (77.67s)
--- PASS: TestAccAWSLambdaFunction_VPC_withInvocation (81.94s)
--- PASS: TestAccAWSLambdaFunction_encryptedEnvVariables (83.55s)
--- PASS: TestAccAWSLambdaFunction_runtimeValidation_java8 (33.10s)
--- PASS: TestAccAWSLambdaFunction_concurrencyCycle (86.51s)
--- PASS: TestAccAWSLambdaFunction_runtimeValidation_python36 (31.53s)
--- PASS: TestAccAWSLambdaFunction_runtimeValidation_python37 (26.37s)
--- PASS: TestAccAWSLambdaFunction_tracingConfig (92.08s)
--- PASS: TestAccAWSLambdaFunction_runtimeValidation_nodeJs43 (49.51s)
--- PASS: TestAccAWSLambdaFunction_tags (43.05s)
--- PASS: TestAccAWSLambdaFunction_envVariables (103.46s)

[bflad]

This has been released in version 1.51.0 of the AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!