feat(comment): add comment on a variable

spec/fixtures/comment/svar_input.go

@@ -0,0 +1,5 @@
+package main
+
+func varTest() {
+	s := "something"
+}

spec/fixtures/comment/svar_output.go

@@ -0,0 +1,6 @@
+package main
+
+func varTest() {
+	// s 
+	s := "something"
+}

spec/fixtures/comment/var_input.go

@@ -0,0 +1,5 @@
+package main
+
+func test() {
+	var imAVar string
+}

spec/fixtures/comment/var_output.go

@@ -0,0 +1,6 @@
+package main
+
+func test() {
+	// imAVar 
+	var imAVar string
+}

spec/integration/comment_test.lua

@@ -50,6 +50,14 @@ comment["should add a comment on interface with many method"] = function()
   do_the_test("interface_many_method", { 5, 2 })
 end
 
+comment["should add a comment on a var"] = function()
+  do_the_test("var", { 4, 2 })
+end
+
+comment["should add a comment on a short declared var"] = function()
+  do_the_test("svar", { 4, 8 })
+end
+
 comment["otherwise should add // above cursor"] = function()
   do_the_test("empty", { 1, 1 })
 end