Fix Lambda update failure (#526)

#525

```
The runtime parameter of nodejs8.10 is no longer supported for creating or updating AWS Lambda functions. We recommend you use the new runtime (nodejs12.x) while creating or updating functions.
```

Current Code:
First, update the function code.
At this time, the configuration is still outdated, so the runtime updates it with nodejs.8.10, which results in an error.

Modifications:
Update your settings at the beginning.
This will update the runtime, so the update is expected to succeed.

Since I can't create any nodejs8.10 functions already, I can't confirm their operation at hand.

Author: abetomo

lib/main.js

@@ -544,31 +544,37 @@ so you can easily test run multiple events.
       FunctionName: params.FunctionName,
       Publish: params.Publish
     }, params.Code)
+
     return new Promise((resolve, reject) => {
-      const request = lambda.updateFunctionCode(_params, (err) => {
+      const updateConfigRequest = lambda.updateFunctionConfiguration({
+        FunctionName: params.FunctionName,
+        Description: params.Description,
+        Handler: params.Handler,
+        MemorySize: params.MemorySize,
+        Role: params.Role,
+        Timeout: params.Timeout,
+        Runtime: params.Runtime,
+        VpcConfig: params.VpcConfig,
+        Environment: params.Environment,
+        KMSKeyArn: params.KMSKeyArn,
+        DeadLetterConfig: params.DeadLetterConfig,
+        TracingConfig: params.TracingConfig,
+        Layers: params.Layers
+      }, (err, configResponse) => {
         if (err) return reject(err)
 
-        lambda.updateFunctionConfiguration({
-          FunctionName: params.FunctionName,
-          Description: params.Description,
-          Handler: params.Handler,
-          MemorySize: params.MemorySize,
-          Role: params.Role,
-          Timeout: params.Timeout,
-          Runtime: params.Runtime,
-          VpcConfig: params.VpcConfig,
-          Environment: params.Environment,
-          KMSKeyArn: params.KMSKeyArn,
-          DeadLetterConfig: params.DeadLetterConfig,
-          TracingConfig: params.TracingConfig,
-          Layers: params.Layers
-        }, (err, data) => {
+        const updateCodeReuest = lambda.updateFunctionCode(_params, (err) => {
           if (err) return reject(err)
-          resolve(data)
+          resolve(configResponse)
+        })
+
+        updateCodeReuest.on('retry', (response) => {
+          console.log(response.error.message)
+          console.log('=> Retrying')
         })
       })
 
-      request.on('retry', (response) => {
+      updateConfigRequest.on('retry', (response) => {
         console.log(response.error.message)
         console.log('=> Retrying')
       })