*: drop go 1.13 support

.circleci/config.yml

@@ -3,11 +3,6 @@ orbs:
   codecov: codecov/codecov@1.0.5
 
 executors:
-  go1_13:
-    docker:
-      - image: circleci/golang:1.13
-        environment:
-          GO111MODULE: "on"
   go1_14:
     docker:
       - image: circleci/golang:1.14
@@ -54,16 +49,6 @@ jobs:
           name: go-vet
           command: go vet ./...
 
-  test_1_13:
-    working_directory: /go/src/github.com/nspcc-dev/neo-go
-    executor: go1_13
-    steps:
-      - checkout
-      - run: git submodule sync
-      - run: git submodule update --init
-      - gomod
-      - run: go test -v -race ./...
-
   test_1_14:
     working_directory: /go/src/github.com/nspcc-dev/neo-go
     executor: go1_14
@@ -132,10 +117,6 @@ workflows:
           filters:
             tags:
               only: v/[0-9]+\.[0-9]+\.[0-9]+/
-      - test_1_13:
-          filters:
-            tags:
-              only: v/[0-9]+\.[0-9]+\.[0-9]+/
       - test_1_14:
           filters:
             tags:

.github/workflows/run_tests.yml

@@ -109,7 +109,7 @@ jobs:
     runs-on: ubuntu-18.04
     strategy:
       matrix:
-        go_versions: [ '1.13', '1.14', '1.15' ]
+        go_versions: [ '1.14', '1.15' ]
       fail-fast: false
     steps:
       - uses: actions/checkout@v2

README.md

@@ -36,7 +36,7 @@ Neo 3 code (0.90.0 being compatible with Neo 3 preview2).
 
 ## Installation
 
-Go: 1.13+
+Go: 1.14+
 
 Install dependencies.
 

go.mod

@@ -30,4 +30,4 @@ require (
 	gopkg.in/yaml.v2 v2.2.4
 )
 
-go 1.13
+go 1.14