fix value_delta again

bot.go

@@ -1060,7 +1060,10 @@ func botGraphValueDelta(m *tb.Message) {
 				v0 = v1
 				v1 = v2
 				v2 = v[i].Y
-				v[i].Y = (v0 + v1 + v2) / 3
+				v[i].Y = (v0+v1+v2)/3 - v1
+				if math.Abs(v[i].Y) > maxVal {
+					maxVal = math.Abs(v[i].Y)
+				}
 			}
 			vals[coID] = v[3:]
 		}

version.go

@@ -1,6 +1,6 @@
 // Code generated by version.sh (@generated) DO NOT EDIT.
 package main
-var githash = "c6a235e"
-var buildstamp = "2021-12-08_12:15:03"
-var commits = "240"
-var version = "c6a235e-b240 - 2021-12-08_12:15:03"
+var githash = "4ad875c"
+var buildstamp = "2021-12-08_12:20:30"
+var commits = "241"
+var version = "4ad875c-b241 - 2021-12-08_12:20:30"