DB: 1.16 protocol, enable journeyLeg, 2.8.0

Although `journeyLeg()` can be unreliable for DB (#49), I enabled
it here. This is not a breaking change because, previously, you
were not able to use `journeyLeg()` in the first place. Let's hope
that it works for people. 🙈

By changing to the 1.16 protocol, we support the `polyline` option
of `journeyLeg()` as well.

p/db/index.js

@@ -15,7 +15,7 @@ const formatBitmask = createFormatBitmask(modes)
 const transformReqBody = (body) => {
 	body.client = {id: 'DB', v: '16040000', type: 'IPH', name: 'DB Navigator'}
 	body.ext = 'DB.R15.12.a'
-	body.ver = '1.15'
+	body.ver = '1.16'
 	body.auth = {type: 'AID', aid: 'n91dB8Z77MLdoR0K'}
 
 	return body
@@ -145,7 +145,9 @@ const dbProfile = {
 	parseJourney: createParseJourney,
 
 	formatStation,
-	formatProducts
+	formatProducts,
+
+	journeyLeg: true // todo: #49
 }
 
 module.exports = dbProfile

package.json

@@ -1,7 +1,7 @@
 {
 	"name": "hafas-client",
 	"description": "JavaScript client for HAFAS public transport APIs.",
-	"version": "2.7.5",
+	"version": "2.8.0",
 	"main": "index.js",
 	"files": [
 		"index.js",