Error strings should not be capitalized (unless beginning with proper

nouns or acronyms) or end with punctuation, since they are usually
printed following other context.

hd44780/gpio.go

@@ -87,7 +87,7 @@ func (g *GPIO) write4BitMode(data byte) {
 // Ram address can be changed by writing address in command mode
 func (g *GPIO) Read(data []byte) (n int, err error) {
 	if len(data) == 0 {
-		return 0, errors.New("Length greater than 0 is required")
+		return 0, errors.New("length greater than 0 is required")
 	}
 	g.rw.High()
 	g.reconfigureGPIOMode(machine.PinInput)

hd44780/hd44780.go

@@ -66,7 +66,7 @@ func (d *Device) Configure(cfg Config) error {
 	d.width = uint8(cfg.Width)
 	d.height = uint8(cfg.Height)
 	if d.width == 0 || d.height == 0 {
-		return errors.New("Width and height must be set")
+		return errors.New("width and height must be set")
 	}
 	memoryMap := uint8(ONE_LINE)
 	if d.height > 1 {