correct num holes and add Nano board

template/Arduino_Nano/Arduino_Nano-cache.bak

@@ -0,0 +1,18 @@
+EESchema-LIBRARY Version 2.3
+#encoding utf-8
+#
+# CONN_1
+#
+DEF ~CONN_1 P 0 30 N N 1 F N
+F0 "P" 80 0 40 H V L CNN
+F1 "CONN_1" 0 55 30 H I C CNN
+F2 "" 0 0 60 H V C CNN
+F3 "" 0 0 60 H V C CNN
+DRAW
+C 0 0 31 0 1 0 N
+P 2 0 1 0  -30 0  -50 0 N
+X 1 1 -150 0 100 R 60 60 1 1 P
+ENDDRAW
+ENDDEF
+#
+#End Library