fix typo in vizapp title

vizapp/ui.R

@@ -7,9 +7,9 @@ shinyUI(fluidPage(
   verticalLayout(
 
     # Application title
-    titlePanel("Astrocyte ChiPseq Example"),
+    titlePanel("Astrocyte ChIP-seq Example"),
 
     plotOutput("plot1"),
     plotOutput("plot2")
   )
-))
\ No newline at end of file
+))