Fix linePosition zero based indexing

Even though the intention was to have the line and the linePosition to be 1-indexed as these numbers are for the user, the linePosition itself was 0-indexed.

Author: QuickWrite

src/main/kotlin/Error.kt

@@ -17,7 +17,7 @@ abstract class JSONParseException(message: String, private val position: JSONPos
         return """
             error: $lineNumber:$linePosition $message
             $lineNumber | $line
-            ${" ".repeat(lineNumber.length)} | ${" ".repeat(linePosition)}${"^".repeat(length)}
+            ${" ".repeat(lineNumber.length)} | ${" ".repeat(linePosition - 1)}${"^".repeat(length)}
         """.trimIndent()
     }
 }

src/main/kotlin/lexer/StringJSONLexer.kt

@@ -229,7 +229,7 @@ class StringJSONLexer(private val content: CharSequence) : JSONLexer {
             }
 
             override fun linePosition(): Int {
-                return position - startLine
+                return position - startLine + 1
             }
 
             override fun getLength(): Int {