Add quantity power rate

[groscoe2]

I believe I've changed everything necessary to add power rate (base units are watts per second). Please let me know if I missed anything required to merge!

[iliekturtles]

Thanks for the PR. If you could add these formatting fixes I'll merge!

diff --git a/src/si/power_rate.rs b/src/si/power_rate.rs
index e65dcba..9134208 100644
--- a/src/si/power_rate.rs
+++ b/src/si/power_rate.rs
@@ -17,40 +17,29 @@ quantity! {
             "yottawatts per second";
         @zettawatt_per_second: prefix!(zetta); "ZW/s", "zettawatt per second",
             "zettawatts per second";
-        @exawatt_per_second: prefix!(exa); "EW/s", "exawatt per second",
-            "exawatts per second";
-        @petawatt_per_second: prefix!(peta); "PW/s", "petawatt per second",
-            "petawatts per second";
-        @terawatt_per_second: prefix!(tera); "TW/s", "terawatt per second",
-            "terawatts per second";
-        @gigawatt_per_second: prefix!(giga); "GW/s", "gigawatt per second",
-            "gigawatts per second";
-        @megawatt_per_second: prefix!(mega); "MW/s", "megawatt per second",
-            "megawatts per second";
-        @kilowatt_per_second: prefix!(kilo); "kW/s", "kilowatt per second",
-            "kilowatts per second";
+        @exawatt_per_second: prefix!(exa); "EW/s", "exawatt per second", "exawatts per second";
+        @petawatt_per_second: prefix!(peta); "PW/s", "petawatt per second", "petawatts per second";
+        @terawatt_per_second: prefix!(tera); "TW/s", "terawatt per second", "terawatts per second";
+        @gigawatt_per_second: prefix!(giga); "GW/s", "gigawatt per second", "gigawatts per second";
+        @megawatt_per_second: prefix!(mega); "MW/s", "megawatt per second", "megawatts per second";
+        @kilowatt_per_second: prefix!(kilo); "kW/s", "kilowatt per second", "kilowatts per second";
         @hectowatt_per_second: prefix!(hecto); "hW/s", "hectowatt per second",
             "hectowatts per second";
-        @decawatt_per_second: prefix!(deca); "daW/s", "decawatt per second",
-            "decawatts per second";
+        @decawatt_per_second: prefix!(deca); "daW/s", "decawatt per second", "decawatts per second";
         /// Derived unit of power rate.
         @watt_per_second: prefix!(none); "W/s", "watt per second", "watts per second";
-        @deciwatt_per_second: prefix!(deci); "dW/s", "deciwatt per second",
-            "deciwatts per second";
+        @deciwatt_per_second: prefix!(deci); "dW/s", "deciwatt per second", "deciwatts per second";
         @centiwatt_per_second: prefix!(centi); "cW/s", "centiwatt per second",
             "centiwatts per second";
         @milliwatt_per_second: prefix!(milli); "mW/s", "milliwatt per second",
             "milliwatts per second";
         @microwatt_per_second: prefix!(micro); "µW/s", "microwatt per second",
             "microwatts per second";
-        @nanowatt_per_second: prefix!(nano); "nW/s", "nanowatt per second",
-            "nanowatts per second";
-        @picowatt_per_second: prefix!(pico); "pW/s", "picowatt per second",
-            "picowatts per second";
+        @nanowatt_per_second: prefix!(nano); "nW/s", "nanowatt per second", "nanowatts per second";
+        @picowatt_per_second: prefix!(pico); "pW/s", "picowatt per second", "picowatts per second";
         @femtowatt_per_second: prefix!(femto); "fW/s", "femtowatt per second",
             "femtowatts per second";
-        @attowatt_per_second: prefix!(atto); "aW/s", "attowatt per second",
-            "attowatts per second";
+        @attowatt_per_second: prefix!(atto); "aW/s", "attowatt per second", "attowatts per second";
         @zeptowatt_per_second: prefix!(zepto); "zW/s", "zeptowatt per second",
             "zeptowatts per second";
         @yoctowatt_per_second: prefix!(yocto); "yW/s", "yoctowatt per second",
@@ -68,8 +57,8 @@ quantity! {
             "horsepower per second (electric)";
         @horsepower_per_second_metric: 7.354_988_E2; "hp/s (M)", "metric horsepower per second",
             "metric horsepower per second";
-        @horsepower_per_second_imperial: 7.457_0_E2; "hp/s (I)",
-            "horsepower per second (Imperial)", "horsepower per second (Imperial)";
+        @horsepower_per_second_imperial: 7.457_0_E2; "hp/s (I)", "horsepower per second (Imperial)",
+            "horsepower per second (Imperial)";
         @hydraulic_horsepower_per_second: 7.460_43_E2; "hp/s (hydraulic)",
             "hydraulic horsepower per second", "hydraulic horsepower per second";
     }

[groscoe2]

Should be good to go now, thank you!

[iliekturtles]

Mind squashing the two commits?

[groscoe2]

Took a bit to figure out how to do that, but it should be squashed now!

[iliekturtles]

Thanks for the quick fixes. Merged!