Upgrade to sbt 1.1.0

This decapitalizes the label of `S3CredentialsProvider`,
otherwise sbt 1.1.0 throws an exception like the following:

    java.lang.IllegalArgumentException: requirement failed: A named attribute key must start with a lowercase letter: S3CredentialsProvider

.travis.yml

@@ -6,7 +6,7 @@ matrix:
   include:
   - env: SBT_VERSION="0.13.16"
     scala: 2.10.6
-  - env: SBT_VERSION="1.0.4"
+  - env: SBT_VERSION="1.1.0"
     scala: 2.12.4
 
 script:

README.md

@@ -197,13 +197,13 @@ roleArn = arn:aws:iam::123456789012:role/RoleName
 
 ### Custom S3 Credentials
 
-If the default credential providers do not work for you then you can specify your own AWSCredentialsProvider using the `S3CredentialsProvider` SettingKey in your `build.sbt` file:
+If the default credential providers do not work for you then you can specify your own AWSCredentialsProvider using the `s3CredentialsProvider` SettingKey in your `build.sbt` file:
 
 ```scala
 import com.amazonaws.auth.{AWSCredentialsProviderChain, DefaultAWSCredentialsProviderChain}
 import com.amazonaws.auth.profile.ProfileCredentialsProvider
 
-S3CredentialsProvider := { (bucket: String) =>
+s3CredentialsProvider := { (bucket: String) =>
   new AWSCredentialsProviderChain(
     new ProfileCredentialsProvider("my_profile"),
     DefaultAWSCredentialsProviderChain.getInstance()
@@ -216,7 +216,7 @@ If you are really lazy and want to provide static credentials using this in your
 ```scala
 import com.amazonaws.auth.{AWSStaticCredentialsProvider, BasicAWSCredentials}
 
-S3CredentialsProvider := { (bucket: String) =>
+s3CredentialsProvider := { (bucket: String) =>
   new AWSStaticCredentialsProvider(new BasicAWSCredentials("your_accessKey", "your_secretKey"))
 }
 ```

build.sbt

@@ -30,7 +30,7 @@ scriptedBufferLog := false
 
 scriptedLaunchOpts ++= Seq("-Xmx1024M", "-Dplugin.version=" + version.value)
 
-crossSbtVersions := Vector("0.13.16", "1.0.4")
+crossSbtVersions := Vector("0.13.16", "1.1.0")
 
 val amazonSDKVersion = "1.11.236"
 

project/build.properties

@@ -1 +1 @@
-sbt.version=1.0.4
+sbt.version=1.1.0

src/main/scala/fm/sbt/S3ResolverPlugin.scala

@@ -31,8 +31,13 @@ import scala.util.Try
 object S3ResolverPlugin extends AutoPlugin {
   object autoImport extends S3Implicits {
 
+    @deprecated("use `s3CredentialsProvider` (starting with lower case) instead", "0.14.0")
     lazy val S3CredentialsProvider: SettingKey[String => AWSCredentialsProvider] = {
-      SettingKey[String => AWSCredentialsProvider]("S3CredentialsProvider", "AWS credentials provider to access S3")
+      s3CredentialsProvider
+    }
+
+    lazy val s3CredentialsProvider: SettingKey[String => AWSCredentialsProvider] = {
+      settingKey[String => AWSCredentialsProvider]("AWS credentials provider to access S3")
     }
 
     lazy val showS3Credentials: InputKey[Unit] = {
@@ -46,13 +51,13 @@ object S3ResolverPlugin extends AutoPlugin {
   override def trigger: PluginTrigger = allRequirements
 
   override def projectSettings: Seq[Setting[_]] = Seq(
-    S3CredentialsProvider := S3URLHandler.defaultCredentialsProviderChain,
+    s3CredentialsProvider := S3URLHandler.defaultCredentialsProviderChain,
     showS3Credentials := {
       val log = state.value.log
 
       spaceDelimited("<arg>").parsed match {
         case bucket :: Nil =>
-          val provider: AWSCredentialsProvider = S3CredentialsProvider.value(bucket)
+          val provider: AWSCredentialsProvider = s3CredentialsProvider.value(bucket)
 
           Try {
             Option(provider.getCredentials) match {
@@ -114,7 +119,7 @@ object S3ResolverPlugin extends AutoPlugin {
 
       val extracted: Extracted = Project.extract(state)
 
-      S3URLHandler.registerBucketCredentialsProvider(extracted.get(S3CredentialsProvider))
+      S3URLHandler.registerBucketCredentialsProvider(extracted.get(s3CredentialsProvider))
 
       state
     }