build: Bump pressbooks-build-tools from 0.9.0 to 0.10.0 (#61)

Bumps [pressbooks-build-tools](https://github.com/pressbooks/pressbooks-build-tools) from 0.9.0 to 0.10.0.
- [Release notes](https://github.com/pressbooks/pressbooks-build-tools/releases/tag/0.10.0)
- [Commits](https://github.com/pressbooks/pressbooks-build-tools/compare/0.9.0...0.10.0)

package.json

@@ -54,7 +54,7 @@
     "node": ">= 6.9.4"
   },
   "devDependencies": {
-    "pressbooks-build-tools": "^0.9.0"
+    "pressbooks-build-tools": "^0.10.0"
   },
   "dependencies": {
     "aetna": "^1.0.0-alpha",