Anet A8 BLTouch Holder

I tried the version made by jeanmichel, but it didn't work for me:
- original BLTouch version Smart is bigger
- when change hole for sensor then still had issue with distance from nozzle.
- original model had a couple of issues so Cura slicer didn't slice it correctly

So I decided to make a remix with a little bit changed dimensions and it fits perfectly for my Anet A8 now.

Changed blocks in Configuration.h for Marlin 1.1.6

Enable BLTouch
```
#define BLTOUCH
#define SERVO0_PIN 27
#if ENABLED(BLTOUCH)
#define BLTOUCH_DELAY 100 // (ms) Enable and increase if needed
#endif
```
Disable changing logic for Z
```
#define Z_MIN_PROBE_ENDSTOP_INVERTING false // set to true to invert the logic of the probe.
```
Distances from the nozzle
```
#define X_PROBE_OFFSET_FROM_EXTRUDER -26 // X offset: -left +right [of the nozzle]
#define Y_PROBE_OFFSET_FROM_EXTRUDER -38 // Y offset: -front +behind [the nozzle]
#define Z_PROBE_OFFSET_FROM_EXTRUDER 1.5 // Z offset: