Openpgp security update (V2) (#31)

* Change keyring unlock functionalities

* Add keyring#Lock, keyring#CheckIntegrity, tests

* Update helpers, fix bugs

* Update go.mod with ProtonMail/crypto commit

* Change key management system

* Clear keys from memory + tests

* Create SessionKey with direct encryption for datapackets. Move symmetrickey to password.

* Fix upstream dependencies

* Update module to V2, documentation

* Add linter

* Add v2 folder to .gitignore

* Minor changes to KeyID getters

* Remove old changelog

* Improve docs, remove compilation script

.travis.yml

@@ -1,7 +1,42 @@
+# use the latest ubuntu environment (18.04) available on travis
+dist: bionic
+
 language: go
+
+# Force-enable Go modules. Also force go to use the code in vendor/
+# These will both be unnecessary when Go 1.14 lands.
+env: GO111MODULE=on
+
 go:
   - 1.11.x
   - 1.12.x
-env:
-  - GO111MODULE=on GOFLAGS=-mod=readonly
+  - 1.13.x
+
+# Only clone the most recent commit.
+git:
+  depth: 1
+
+# Skip the install step. Don't `go get` dependencies. Only build with the code
+# in vendor/
 install: true
+
+# Don't email me the results of the test runs.
+notifications:
+  email: false
+
+# Anything in before_script that returns a nonzero exit code will flunk the
+# build and immediately stop. It's sorta like having set -e enabled in bash.
+# Make sure you've pinned the version of golangci-lint by running this command
+# in your project directory:
+#   GO111MODULE=on go get github.com/golangci/golangci-lint@v1.21.0
+# You should see this line in your go.mod file:
+#   github.com/golangci/golangci-lint v1.21.0
+before_script:
+  - go install github.com/golangci/golangci-lint/cmd/golangci-lint
+
+# script always runs to completion (set +e). If we have linter issues AND a
+# failing test, we want to see both. Configure golangci-lint with a
+# .golangci.yml file at the top level of your repo.
+script:
+  - golangci-lint run       # run a bunch of code checkers/linters in parallel
+  - go test -v -race ./...  # Run all the tests with the race detector enabled