update models/readme.md

Added an addition function for evaluate in Julia minimal server example to make it more consistent with python and C++ examples (earlier, an anonymous in-line function was used)

models/README.md

@@ -150,11 +150,15 @@ Optionally, configuration options may be passed to the model by the client: `con
 For more flexibility, the model's input and output dimensions may optionally depend on `config`.
 
 ```
-testmodel = UMBridge.Model(name="forward", inputSizes=[1], outputSizes=[1])
-
-UMBridge.define_evaluate(testmodel, (input, config) -> (2*input))
+# Define the model behavior
+function evaluate(input::Vector{Any}, config::Dict{String, Any})
+    output = 2 * input
+    return [output]
+end
 
-UMBridge.serve_models([testmodel], 4242)
+testmodel = UMBridge.Model(name="forward", inputSizes=[1], outputSizes=[1])
+UMBridge.define_evaluate(testmodel, evaluate)
+UMBridge.serve_models([testmodel], 4232)
 ```
 
 ## MUQ server