refactor: rename files to follow Go convention

testdata/modifies_value_receiver.go

@@ -0,0 +1,14 @@
+package fixtures
+
+type data struct {
+	num   int
+	key   *string
+	items map[string]bool
+}
+
+func (this data) vmethod() {
+	this.num = 8 // MATCH /suspicious assignment to a by-value method receiver/
+	*this.key = "v.key"
+	this.items = make(map[string]bool) // MATCH /suspicious assignment to a by-value method receiver/
+	this.items["vmethod"] = true
+}