Consume context on destroy

.gitignore

@@ -1,3 +1,4 @@
 /target
 **/*.rs.bk
 Cargo.lock
+.idea

Cargo.toml

@@ -10,4 +10,4 @@ license = "Unlicense"
 description = "Safe(er) rust wrapper for dukbind."
 
 [dependencies]
-dukbind = "0.0.4"
+dukbind = { path = "../dukbind" }

src/lib.rs

@@ -370,10 +370,9 @@ impl DukContext {
         }
     }
     /// Destroy the duktape context's heap. Should not be used after calling this.
-    pub fn destroy(&mut self) {
+    pub fn destroy(self) {
         unsafe {
             duk_destroy_heap(self.ctx.expect("Invalid context pointer."));
-            self.ctx = None;
         }
     }
     /// Decode a JSON string into the context, returning a DukObject.