Update médocs to ^1.0

docs/mkdocs.yml

@@ -7,7 +7,7 @@ theme:
 extra:
   version: 2.0
 
-pages:
+nav:
   - Introduction: index.md
   - Basic Usage: basic-usage.md
   - Libraries: libraries.md

pyproject.toml

@@ -47,7 +47,7 @@ virtualenv = { version = "^16.0", python = "~2.7" }
 [tool.poetry.dev-dependencies]
 pytest = "^3.4"
 pytest-cov = "^2.5"
-mkdocs = "^0.17.3"
+mkdocs = "^1.0"
 pymdown-extensions = "^4.9"
 pygments = "^2.2"
 pytest-mock = "^1.9"