Set minimum line number in editor to 1

Author: ablazejuk

index.html

@@ -156,7 +156,7 @@ <h2>Musicians' Helper - Editor</h2>
                             <div class="form-group row">
                                 <label class="col-md-4 col-form-label" for="line-number">Line Number</label>
                                 <div class="col-md-8">
-                                    <input id="line-number" class="form-control" name="line-number" type="number" min="0" step="1" placeholder="30">
+                                    <input id="line-number" class="form-control" name="line-number" type="number" min="1" step="1" placeholder="30">
                                 </div>
                             </div>