only lint new issues, add linting to travis run

.golangci.yml

@@ -0,0 +1,43 @@
+run:
+  # timeout for analysis
+  deadline: 4m
+
+  # Linting uses a lot of memory. Keep it under control by only running a single
+  # worker.
+  concurrency: 1
+
+linters-settings:
+  gofmt:
+    # simplify code: gofmt with `-s` option, true by default
+    simplify: true
+
+linters:
+  enable-all: true
+  disable:
+  # Global variables are used in many places throughout the code base.
+  - gochecknoglobals
+
+  # Some lines are over 80 characters on purpose and we don't want to make them
+  # even longer by marking them as 'nolint'.
+  - lll
+
+  # We don't care (enough) about misaligned structs to lint that.
+  - maligned
+
+  # We have long functions, especially in tests. Moving or renaming those would
+  # trigger funlen problems that we may not want to solve at that time.
+  - funlen
+
+  # Disable for now as we haven't yet tuned the sensitivity to our codebase
+  # yet.  Enabling by default for example, would also force new contributors to
+  # potentially extensively refactor code, when they want to smaller change to
+  # land.
+  - gocyclo
+
+  # Instances of table driven tests that don't pre-allocate shouldn't trigger
+  # the linter.
+  - prealloc
+
+issues:
+  # Only show newly introduced problems.
+  new-from-rev: 36838cf7f464cf73b0201798063b2caffeae4250

.travis.yml

@@ -18,7 +18,7 @@ sudo: required
 
 script:
   - export GO111MODULE=on
-  - make unit
+  - make lint unit
 
 after_script:
   - echo "Uploading to termbin.com..." && find *.log | xargs -I{} sh -c "cat {} | nc termbin.com 9999 | xargs -r0 printf '{} uploaded to %s'"