Fix typo in run_node!() example

Author: ConnectedSystems

README.md

@@ -254,7 +254,7 @@ through all relevant nodes upstream.
 timesteps = sim_length(climate)
 for ts in (1:timesteps)
     for outlet in outlets
-        run_node!(sn, outlet, climate, ts)
+        run_node!(sn[outlet], climate, ts)
     end
 end
 ```

src/Streamfall.jl

@@ -243,7 +243,7 @@ function run_node!(
     if checkbounds(Bool, node.outflow, ts)
         if node.outflow[ts] != undef
             # already ran for this time step so no need to run
-            return node.outflow[ts], node.level[ts]
+            return node.outflow[ts]
         end
     end