update build version

Author: sfackler

.circleci/config.yml

@@ -21,18 +21,15 @@ save_deps: &SAVE_DEPS
 version: 2
 jobs:
   build:
-    working_directory: ~/build
     docker:
-      - image: rust:1.23.0
+      - image: rust:1.26.2
         environment:
           RUSTFLAGS: -D warnings
       - image: sfackler/rust-postgres-test:4
     steps:
       - checkout
       - *RESTORE_REGISTRY
       - run: cargo generate-lockfile
-      - run: cargo update -p nalgebra --precise 0.14.3 # 0.14.4 requires 1.26 :(
-      - run: cargo update -p geo-types --precise 0.1.0
       - *SAVE_REGISTRY
       - run: rustc --version > ~/rust-version
       - *RESTORE_DEPS