all: rename the module to support v2 versions

Before this change, @latest and specific versions like @v2.4.29 would
fail with module-aware go get, as the module was a v0/v1 instead of the
expected v2.

Amend the go.mod and all the imports. This is just the first step; to
make @latest fully work, we'll need to also release a new tagged
version, and verify that it works.

While at it, update and simplify the 'go get' instructions in the
README.

For #30.

README.md

@@ -22,12 +22,12 @@ or via
 wget https://github.com/fuzzitdev/fuzzit/releases/download/<version>/fuzzit_<version>_<os>_<arch>
 ```
 
-#### Go Get
+#### Go get
 
-Also, you can use the following command to download and compile (This usually takes some time so, it's usually faster to either download a pre-compiled release or download the source and build locally):
+You can also use Go 1.12 or later to build the latest stable version from source:
 
 ```bash
-go get -v -u github.com/fuzzitdev/fuzzit
+GO111MODULE=on go get github.com/fuzzitdev/fuzzit/v2
 ```
 
 #### Homebrew Tap

cmd/auth.go

@@ -19,7 +19,7 @@ package cmd
 import (
 	"log"
 
-	"github.com/fuzzitdev/fuzzit/client"
+	"github.com/fuzzitdev/fuzzit/v2/client"
 	"github.com/spf13/cobra"
 )
 

cmd/create.go

@@ -18,7 +18,7 @@ package cmd
 import (
 	"log"
 
-	"github.com/fuzzitdev/fuzzit/client"
+	"github.com/fuzzitdev/fuzzit/v2/client"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 )

cmd/download.go

@@ -19,7 +19,7 @@ import (
 	"log"
 	"strings"
 
-	"github.com/fuzzitdev/fuzzit/client"
+	"github.com/fuzzitdev/fuzzit/v2/client"
 	"github.com/spf13/cobra"
 )
 

cmd/get.go

@@ -18,7 +18,7 @@ package cmd
 import (
 	"log"
 
-	"github.com/fuzzitdev/fuzzit/client"
+	"github.com/fuzzitdev/fuzzit/v2/client"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 )

cmd/job.go

@@ -19,7 +19,7 @@ import (
 	"log"
 	"strings"
 
-	"github.com/fuzzitdev/fuzzit/client"
+	"github.com/fuzzitdev/fuzzit/v2/client"
 	"github.com/spf13/cobra"
 	"gopkg.in/src-d/go-git.v4"
 )

cmd/root.go

@@ -21,7 +21,7 @@ import (
 	"os"
 	"strings"
 
-	"github.com/fuzzitdev/fuzzit/client"
+	"github.com/fuzzitdev/fuzzit/v2/client"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 )

cmd/run.go

@@ -18,7 +18,7 @@ package cmd
 
 import (
 	"fmt"
-	"github.com/fuzzitdev/fuzzit/client"
+	"github.com/fuzzitdev/fuzzit/v2/client"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 	"log"

cmd/target.go

@@ -16,7 +16,7 @@ limitations under the License.
 package cmd
 
 import (
-	"github.com/fuzzitdev/fuzzit/client"
+	"github.com/fuzzitdev/fuzzit/v2/client"
 	"log"
 
 	"github.com/spf13/cobra"

go.mod

@@ -1,4 +1,4 @@
-module github.com/fuzzitdev/fuzzit
+module github.com/fuzzitdev/fuzzit/v2
 
 go 1.12
 

main.go

@@ -17,7 +17,7 @@ limitations under the License.
 package main
 
 import (
-	"github.com/fuzzitdev/fuzzit/cmd"
+	"github.com/fuzzitdev/fuzzit/v2/cmd"
 )
 
 func main() {