breaking: neckstimate always returns 17 for shoulderSlope

We're making shoulderSlope a degree measurements, which defaults to 17.
See #358 for details

packages/utils/src/neckstimate/index.js

@@ -6,6 +6,9 @@ import ratio from './ratio'
 const neckstimate = (neckCircumference = false, measurement = false, breasts = false) => {
   let data = breasts ? withBreasts : withoutBreasts
 
+  // Shoulder slope is in degrees now. Always defaults to 17.
+  if (measurement === 'shoulderSlope') return 17
+
   if (!neckCircumference)
     throw new Error('neckstimate() requires a neck circumference in mm as first parameter')
   if (!measurement) {

packages/utils/src/neckstimate/with-breasts.js

@@ -31,7 +31,7 @@ export default {
   neckCircumference: 340,
   seatCircumference: 1010,
   seatDepth: 165,
-  shoulderSlope: 520,
+  shoulderSlope: 17,
   shoulderToElbow: 340,
   shoulderToShoulder: 415,
   shoulderToWrist: 590,

packages/utils/src/neckstimate/without-breasts.js

@@ -24,7 +24,7 @@ export default {
   neckCircumference: 380,
   seatCircumference: 1020,
   seatDepth: 210,
-  shoulderSlope: 595,
+  shoulderSlope: 17,
   shoulderToElbow: 360,
   shoulderToShoulder: 450,
   shoulderToWrist: 630,