update ceedling to 0.29.0

test/vendor/ceedling/plugins/command_hooks/README.md

@@ -15,7 +15,6 @@ Define any of these sections in :tools: to provide additional hooks to be called
     :pre_link_execute
     :post_link_execute
     :pre_test_fixture_execute
-    :pre_test_fixture_execute
     :pre_test
     :post_test
     :pre_release
@@ -24,13 +23,13 @@ Define any of these sections in :tools: to provide additional hooks to be called
     :post_build
 ```
 
-Each of these tools can support an :executable string and an :args list, like so:
+Each of these tools can support an :executable string and an :arguments list, like so:
 
 ```
 :tools:
   :post_link_execute:
     :executable: objcopy.exe
-    :args:
+    :arguments:
       - ${1} #This is replaced with the executable name
       - output.srec
       - --strip-all
@@ -42,11 +41,13 @@ You may also specify an array of executables to be called in a particular place,
 :tools:
   :post_test:
     -  :executable: echo
-       :args: "${1} was glorious!"
+       :arguments: "${1} was glorious!"
     -  :executable: echo
-       :args:
+       :arguments:
          - it kinda made me cry a little.
          - you?
 ```
 
+Please note that it varies which arguments are being parsed down to the
+hooks. For now see `command_hooks.rb` to figure out which suits you best.
 Happy Tweaking!