chore(dev): prepare development cycle (#464)

Prepare the plugin for the 2.1.1 development cycle and pre-release builds.

Signed-off-by: Ryan Johnson <[email protected]>

Author: tenthirtyam

README.md

@@ -88,7 +88,7 @@ Examples:
 2. Install a specific version of the plugin:
 
     ```shell
-    packer plugins install github.com/vmware/vmware@v2.0.0
+    packer plugins install github.com/vmware/vmware@v2.1.0
     ```
 
 ### Using the Source

version/version.go

@@ -7,8 +7,8 @@ package version
 import "github.com/hashicorp/packer-plugin-sdk/version"
 
 var (
-	Version           = "2.1.0"
-	VersionPrerelease = ""
+	Version           = "2.1.1"
+	VersionPrerelease = "dev"
 	VersionMetadata   = ""
 	PluginVersion     = version.NewPluginVersion(Version, VersionPrerelease, VersionMetadata)
 )