Support objection v2 (#3)

Support objection v2

.travis.yml

@@ -2,8 +2,8 @@ language: node_js
 
 node_js:
   - "8"
-  - "9"
-  - "11"
+  - "10"
+  - "12"
   - "node"
 
 after_script: "npm run coveralls"

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2016-2018 Pixul and project contributors
+Copyright (c) 2016-2019 Pixul and project contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in
@@ -17,4 +17,4 @@ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package.json

@@ -32,12 +32,12 @@
     "db-errors": "0.2.x"
   },
   "devDependencies": {
-    "objection": "1.x.x",
+    "objection": "2.x.x",
     "coveralls": "3.x.x",
     "@hapi/code": "6.x.x",
     "@hapi/lab": "20.x.x"
   },
   "peerDependencies": {
-    "objection": "1.x.x"
+    "objection": ">=1 <3"
   }
 }