all: bump to 3.0.0-alpha1

mvdan · mvdan · commit c5d341842db7 · 2019-03-11T10:25:44.000Z
With the latest v3 changes since we first started work on v3. Updates mvdan#266.
diff --git a/cmd/shfmt/main.go b/cmd/shfmt/main.go
@@ -48,7 +48,7 @@ var (
 	in  io.Reader = os.Stdin
 	out io.Writer = os.Stdout
 
-	version = "v3.0.0-alpha0"
+	version = "v3.0.0-alpha1"
 )
 
 func main() {
