Update go version & add verification/testing tools (#81)

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## What type of PR is this? (check all applicable)

- [ ] Refactor
- [ ] Feature
- [ ] Bug Fix
- [x] Optimization
- [ ] Documentation Update

## Description

## Related Tickets & Documents

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- Related Issue #
- Closes #

## Added/updated tests?

- [ ] Yes
- [ ] No, and this is why: _please replace this line with details on why
tests
      have not been included_
- [ ] I need help with writing tests

## Run verifications and test

- [ ] `make verify` is passing
- [ ] `make test` is passing

1 files changed, 0 insertions, 70 deletions

diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index 4ca34f0..0000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,70 +0,0 @@
-version: 2.1
-
-jobs:
-  "test":
-    parameters:
-      version:
-        type: string
-        default: "latest"
-      golint:
-        type: boolean
-        default: true
-      modules:
-        type: boolean
-        default: true
-      goproxy:
-        type: string
-        default: ""
-    docker:
-      - image: "circleci/golang:<< parameters.version >>"
-    working_directory: /go/src/github.com/gorilla/securecookie
-    environment:
-      GO111MODULE: "on"
-      GOPROXY: "<< parameters.goproxy >>"
-    steps:
-      - checkout
-      - run:
-          name: "Print the Go version"
-          command: >
-            go version
-      - run:
-          name: "Fetch dependencies"
-          command: >
-            if [[ << parameters.modules >> = true ]]; then
-              go mod download
-              export GO111MODULE=on
-            else
-              go get -v ./...
-            fi
-      # Only run gofmt, vet & lint against the latest Go version
-      - run:
-          name: "Run golint"
-          command: >
-            if [ << parameters.version >> = "latest" ] && [ << parameters.golint >> = true ]; then
-              go get -u golang.org/x/lint/golint
-              golint ./...
-            fi
-      - run:
-          name: "Run gofmt"
-          command: >
-            if [[ << parameters.version >> = "latest" ]]; then
-              diff -u <(echo -n) <(gofmt -d -e .)
-            fi
-      - run:
-          name: "Run go vet"
-          command: >
-            if [[ << parameters.version >> = "latest" ]]; then
-              go vet -v ./...
-            fi
-      - run:
-          name: "Run go test (+ race detector)"
-          command: >
-            go test -v -race ./...
-
-workflows:
-  tests:
-    jobs:
-      - test:
-          matrix:
-            parameters:
-              version: ["latest", "1.15", "1.14", "1.13", "1.12", "1.11"]