Update the smart contract decompiler example

examples/a.nim

@@ -1,7 +0,0 @@
-import vm/code_stream, opcode_values
-
-var c = newCodeStream("\x60\x00\x60\x00\x60\x00\x60\x00\x67\x06\xf0\x5b\x59\xd3\xb2\x00\x00\x33\x60\xc8\x5a\x03\xf1")
-
-let opcodes = c.decompile()
-for op in opcodes:
-  echo op[0], " ", op[1], " ", op[2]

examples/decompile_smart_contract.nim

@@ -0,0 +1,14 @@
+import ../src/vm/code_stream, ../src/opcode_values, strformat
+
+var c = newCodeStreamFromUnescaped("0x6003600202600055")
+
+let opcodes = c.decompile()
+for op in opcodes:
+  echo &"[{op[0]}]\t{op[1]}\t{op[2]}"
+
+# [1]     PUSH1   0x03
+# [3]     PUSH1   0x02
+# [4]     MUL
+# [6]     PUSH1   0x00
+# [7]     SSTORE
+# [-1]    STOP

examples/nim.cfg

@@ -1 +0,0 @@
--p:"../src"