Tweak JSON example of unmarshalling a float

The current example shows `json.Unmarshal` on an array of bytes, including
`num:6.0`. In the output however this comes out as `6`. Even in the casting to
`float64`, it comes out as `6`. This can be confusion because it looks like a
simple `int`. By adding an arbitray `.13` you see it's a
float.

examples/json/json.go

@@ -69,7 +69,7 @@ func main() {
     // Now let's look at decoding JSON data into Go
     // values. Here's an example for a generic data
     // structure.
-    byt := []byte(`{"num":6.0,"strs":["a","b"]}`)
+    byt := []byte(`{"num":6.13,"strs":["a","b"]}`)
 
     // We need to provide a variable where the JSON
     // package can put the decoded data. This

examples/json/json.hash

@@ -1,2 +1,2 @@
-12f985bb444e2bd6d72ea52a24ebc5f4f82c5b9b
-4L2wMVv7tW
+9a3d67892b3930bceb1167b59d4d4f5527dadefc
+scgxBwACYx

examples/json/json.sh

@@ -7,8 +7,8 @@ true
 {"apple":5,"lettuce":7}
 {"Page":1,"Fruits":["apple","peach","pear"]}
 {"page":1,"fruits":["apple","peach","pear"]}
-map[num:6 strs:[a b]]
-6
+map[num:6.13 strs:[a b]]
+6.13
 a
 &{1 [apple peach]}
 apple