Upload to attiny85 using optiboot (serial)

[alberiolima]

....
"protocol": "arduino",
"require_upload_port": true,
"speed": 19200,
"protocols": [
"usbtiny",
"arduino"
]
....

{
"build": {
"core": "tiny",
"extra_flags": "-DARDUINO_AVR_ATTINYX5",
"f_cpu": "8000000L",
"mcu": "attiny85",
"neo_pixel_port": "PORTB",
"variant": "tinyX5"
},
"debug": {
"simavr_target": "attiny85"
},
"frameworks": [
"arduino"
],
"name": "Generic ATtiny85",
"upload": {
"extra_flags": "-e",
"maximum_ram_size": 512,
"maximum_size": 8192,
"protocol": "arduino",
"require_upload_port": true,
"speed": 19200,
"protocols": [
"usbtiny",
"arduino"
]
},
"url": "http://www.atmel.com/devices/ATTINY85.aspx",
"vendor": "Atmel"
}