fix #139: hooks execution order

tests/httpbin/debugtalk.py

@@ -0,0 +1,6 @@
+
+def setup_hook_add_kwargs(method, url, kwargs):
+    kwargs["key"] = "value"
+
+def setup_hook_remove_kwargs(method, url, kwargs):
+    kwargs.pop("key")

tests/httpbin/hooks.yml

@@ -0,0 +1,16 @@
+- config:
+    name: basic test with httpbin
+    request:
+        base_url: https://httpbin.org/
+
+- test:
+    name: headers
+    request:
+        url: /headers
+        method: GET
+    setup_hooks:
+        - setup_hook_add_kwargs
+        - setup_hook_remove_kwargs
+    validate:
+        - eq: ["status_code", 200]
+        - eq: [content.headers.Host, "httpbin.org"]