fix: var declaration and module name update.

examples/simple-grep.rn

@@ -1,40 +1,40 @@
-import Argparser
+import argparser
 
 fun main() {
-    parser = Argparser.Argparser()
+    var parser = argparser.Argparser()
     parser.add_flag("--help", "-h", "Show this help text and exit")
     parser.add_pos_opt("query", "String to query", required=true)
     parser.add_pos_opt("file", "File to query string in", required=true)
     parser.add_flag("--line-numbers", "-n", "Show line numbers")
     parser.add_named("--max-lines", "Maximum amount of lines to show", conversor=int)
-    args = parser.parse(argv[:])
+    var args = parser.parse(argv[:])
 
     if args["--help"] {
         print(parser.usage(argv[0]))
         exit()
     }
 
-    f = File(args["file"], "r")
-    lines = (String(f.read())).split("\n")
+    var f = File(args["file"], "r")
+    var lines = (String(f.read())).split("\n")
     f.close()
 
-    matched_lines = []
-    i = 0
+    var matched_lines = []
+    var i = 0
     for line in lines {
         if args["query"] in line {
             arr_append(matched_lines, [i, line])
         }
-        nonlocal i++
+        i++
     }
 
     if not is_null(args["--max-lines"]) {
-        nonlocal matched_lines = matched_lines[:args["--max-lines"]]
+        var matched_lines = matched_lines[:args["--max-lines"]]
     }
 
     for line in matched_lines {
-        s = line[1]
+        var s = line[1]
         if args["--line-numbers"] {
-            nonlocal s = args["file"] + ":" + line[0] + ": " + s
+            var s = args["file"] + ":" + line[0] + ": " + s
         }
         print(s)
     }