Address code review feedback

CONTRIBUTING.md

@@ -41,12 +41,6 @@ If you want to help but you aren't sure where to start, check out our [github la
     cd ${GOPATH}/src/github.com/pilosa/pilosa
     ```
 
-- [Install](https://github.com/golang/dep/#installation) `dep` to manage dependencies:
-
-    ```sh
-    curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
-    ```
-
 - Install Pilosa command line tools:
 
     ```sh
@@ -56,7 +50,7 @@ If you want to help but you aren't sure where to start, check out our [github la
     or
     
     ```
-    dep ensure && go install github.com/pilosa/pilosa/cmd/...
+    go install github.com/pilosa/pilosa/cmd/...
     ```
 
     Running `pilosa` should now run a Pilosa instance.
@@ -78,7 +72,7 @@ Pilosa includes a Makefile that automates several tasks:
     make install
     ```
 
-- Install build dependencies (dep and protoc):
+- Install build dependencies:
 
     ```sh
     make install-build-deps

Makefile

@@ -14,6 +14,7 @@ RELEASE ?= 0
 RELEASE_ENABLED = $(subst 0,,$(RELEASE))
 BUILD_TAGS += $(if $(ENTERPRISE_ENABLED),enterprise)
 BUILD_TAGS += $(if $(RELEASE_ENABLED),release)
+export GO111MODULE=on
 
 # Run tests and compile Pilosa
 default: test build
@@ -157,7 +158,7 @@ require-%:
 		$(info Verified build dependency "$*" is installed.),\
 		$(error Build dependency "$*" not installed. To install, try `make install-$*`))
 
-install-build-deps: install-dep install-protoc-gen-gofast install-protoc install-stringer install-peg
+install-build-deps: install-protoc-gen-gofast install-protoc install-stringer install-peg
 
 install-stringer:
 	go get -u golang.org/x/tools/cmd/stringer