helm_resource: update docs (tilt-dev#539)

Signed-off-by: Nick Santos <[email protected]>

helm_resource/README.md

@@ -33,7 +33,9 @@ def helm_resource(
     resource_deps=None,
     labels=None,
     port_forwards=[],
-    auto_init=True):
+    auto_init=True,
+    pod_readiness='',
+    update_dependencies: False):
   ...
 ```
 
@@ -94,6 +96,13 @@ chart. Must be the same length as `image_deps`.  There are two common patterns.
 
 `auto_init`: Whether this resource runs on `tilt up`. Defaults to `True`. For more info, see the [Manual Update Control docs](https://docs.tilt.dev/manual_update_control.html).
 
+`pod_readiness`: Possible values: 'ignore', 'wait'. Controls whether Tilt waits for
+pods to be ready before the resource is considered healthy (and dependencies
+can start building). By default, Tilt will wait for pods to be ready if it
+thinks a resource has pods.
+
+`update_dependenices`: Runs `helm dependency update` before installing the chart.
+
 ### helm_repo
 
 ```

helm_resource/Tiltfile

@@ -64,6 +64,7 @@ def helm_resource(
       pods to be ready before the resource is considered healthy (and dependencies
       can start building). By default, Tilt will wait for pods to be ready if it
       thinks a resource has pods.
+    update_dependencies: Runs `helm dependency update` before installing the chart.
   """
   if not release_name:
     release_name=name