upgrade to tf 0.12/go 1.11

Dockerfile

@@ -0,0 +1,13 @@
+FROM golang:1.12
+
+WORKDIR /go/src/terraform-provider-dmsnitch
+COPY . .
+
+ENV GOOS=linux
+ENV GOARCH=amd64
+ENV GO111MODULE=on
+
+RUN go get -d -v ./...
+RUN go install -v ./...
+
+VOLUME /go/src/terraform-provider-dmsnitch

Makefile

@@ -0,0 +1,11 @@
+build-linux:
+	docker build -t dms-builder .
+	docker run --rm -v "${PWD}":/go/src/terraform-provider-dmsnitch dms-builder go build
+
+build:
+	go get -d -v ./...
+	go install -v ./...
+	go build
+
+install:
+	cp terraform-provider-dmsnitch  ~/.terraform.d/plugins/

README.md

@@ -1,9 +1,19 @@
 # Terraform [Dead Man's Snitch](https://deadmanssnitch.com/) Provider
 
+## Note on Compatability
+
+This branch is meant to work against the latest version of Terraform. For previous versions, see below
+
+- 0.0.x: Terraform 0.11 and earlier
+- 0.1.x: Terraform 0.12 
+
 ## Requirements
 
-- Terraform 0.10.x or higher
-- Go 1.8 or higher
+- Terraform 0.12.x or higher
+- Go 1.11 or higher
+- Go module support
+
+Please note [the following details](https://www.terraform.io/docs/extend/terraform-0.12-compatibility.html) if you have built this plugin prior to Terraform 0.12. 
 
 ## Building The Provider
 

go.mod

@@ -0,0 +1,5 @@
+module github.com/plukevdh/terraform-provider-dmsnitch
+
+go 1.12
+
+require github.com/hashicorp/terraform v0.12.0