fix Celcius, fixes #34 (#35)

* fix Celcius, fixes #34

* remove stale Celsius todo

devices/bme280/bme280.go

@@ -94,7 +94,7 @@ func (d *Dev) Sense(env *devices.Environment) error {
 	hRaw := int32(buf[6])<<8 | int32(buf[7])
 
 	t, tFine := d.c.compensateTempInt(tRaw)
-	env.Temperature = devices.Celcius(t * 10)
+	env.Temperature = devices.Celsius(t * 10)
 
 	p := d.c.compensatePressureInt64(pRaw, tFine)
 	env.Pressure = devices.KPascal((int32(p) + 127) / 256)

devices/devices.go

@@ -51,25 +51,23 @@ func (m Milli) String() string {
 	return fmt.Sprintf("%d.%03d", m/1000, m%1000)
 }
 
-// Celcius is a temperature at a precision of 0.001°C.
+// Celsius is a temperature at a precision of 0.001°C.
 //
 // Expected range is [-273150, >1000000]
-//
-// BUG(maruel): Add function to convert to Fahrenheit for my American friends.
-type Celcius Milli
+type Celsius Milli
 
 // Float64 returns the value as float64 with 0.001 precision.
-func (c Celcius) Float64() float64 {
+func (c Celsius) Float64() float64 {
 	return Milli(c).Float64()
 }
 
 // String returns the temperature formatted as a string.
-func (c Celcius) String() string {
+func (c Celsius) String() string {
 	return Milli(c).String() + "°C"
 }
 
 // ToF returns the temperature as Fahrenheit, a unit used in the United States.
-func (c Celcius) ToF() Fahrenheit {
+func (c Celsius) ToF() Fahrenheit {
 	return Fahrenheit((c*9+2)/5 + 32000)
 }
 
@@ -116,7 +114,7 @@ func (r RelativeHumidity) String() string {
 
 // Environment represents measurements from an environmental sensor.
 type Environment struct {
-	Temperature Celcius
+	Temperature Celsius
 	Pressure    KPascal
 	Humidity    RelativeHumidity
 }

devices/devices_test.go

@@ -16,8 +16,8 @@ func TestMilli(t *testing.T) {
 	}
 }
 
-func TestCelcius(t *testing.T) {
-	o := Celcius(10010)
+func TestCelsius(t *testing.T) {
+	o := Celsius(10010)
 	if s := o.String(); s != "10.010°C" {
 		t.Fatalf("%#v", s)
 	}