Use \n instead of line.separator

Author: hadim

src/main/java/org/scijava/jupyter/kernel/evaluator/ScijavaEvaluator.java

@@ -160,7 +160,7 @@ private String setLanguage(String code) {
                 this.languageName = code.substring(2, code.indexOf("\n")).trim();
 
                 // Return the code string without the first line
-                code = code.substring(code.indexOf(System.getProperty("line.separator")) + 1);
+                code = code.substring(code.indexOf("\n") + 1);
             } // If only one line
             else {
                 this.languageName = code.substring(2).trim();