Add new integration test scenario 031

```
  × clamp_1 failed
  help: ┍━ left ━━━━━━━━━━┑
        │ (con integer 0) │
        ┕━━━━━━━━━━━━━━━━━┙

        should be equal to

        ┍━ right ━━━━━━━━━━┑
        │ (con integer 10) │
        ┕━━━━━━━━━━━━━━━━━━┙
  ```

examples/acceptance_tests/031/aiken.toml

@@ -0,0 +1,2 @@
+name = "acceptance_test_031"
+version = "0.0.0"

examples/acceptance_tests/031/lib/test.ak

@@ -0,0 +1,13 @@
+pub fn clamp(n: Int, min min: Int, max max: Int) -> Int {
+  if n < min {
+    min
+  } else if n > max {
+    max
+  } else {
+    n
+  }
+}
+
+test clamp_1() {
+  clamp(14, min: 0, max: 10) == 10
+}