reverse-string: Added Cargo.toml to config.json (#1439)

To complete this in the browser, the user will need access to Cargo.toml in order to add dependencies.

Author: PaulT89

exercises/practice/reverse-string/.meta/config.json

@@ -12,6 +12,7 @@
     "hunger",
     "lutostag",
     "ocstl",
+    "PaulT89",
     "petertseng",
     "rofrol",
     "rrredface",
@@ -22,7 +23,8 @@
   ],
   "files": {
     "solution": [
-      "src/lib.rs"
+      "src/lib.rs",
+      "Cargo.toml"
     ],
     "test": [
       "tests/reverse-string.rs"