chore: upgrade to go1.15

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

.drone.yml

@@ -9,7 +9,7 @@ platform:
 steps:
 - name: vet
   pull: always
-  image: golang:1.13
+  image: golang:1.15
   commands:
   - make vet
   volumes:
@@ -18,7 +18,7 @@ steps:
 
 - name: lint
   pull: always
-  image: golang:1.13
+  image: golang:1.15
   commands:
   - make lint
   volumes:
@@ -27,7 +27,7 @@ steps:
 
 - name: misspell
   pull: always
-  image: golang:1.13
+  image: golang:1.15
   commands:
   - make misspell-check
   volumes:
@@ -36,7 +36,7 @@ steps:
 
 - name: test
   pull: always
-  image: golang:1.13
+  image: golang:1.15
   commands:
   - make test
   - make coverage
@@ -71,7 +71,7 @@ platform:
 steps:
 - name: build-push
   pull: always
-  image: golang:1.13
+  image: golang:1.15
   commands:
   - "go build -v -ldflags '-X main.build=${DRONE_BUILD_NUMBER}' -a -o release/linux/amd64/drone-telegram"
   environment:
@@ -83,7 +83,7 @@ steps:
 
 - name: build-tag
   pull: always
-  image: golang:1.13
+  image: golang:1.15
   commands:
   - "go build -v -ldflags '-X main.version=${DRONE_TAG##v} -X main.build=${DRONE_BUILD_NUMBER}' -a -o release/linux/amd64/drone-telegram"
   environment:
@@ -94,7 +94,7 @@ steps:
 
 - name: executable
   pull: always
-  image: golang:1.13
+  image: golang:1.15
   commands:
   - ./release/linux/amd64/drone-telegram --help
 
@@ -150,7 +150,7 @@ platform:
 steps:
 - name: build-push
   pull: always
-  image: golang:1.13
+  image: golang:1.15
   commands:
   - "go build -v -ldflags '-X main.build=${DRONE_BUILD_NUMBER}' -a -o release/linux/arm64/drone-telegram"
   environment:
@@ -162,7 +162,7 @@ steps:
 
 - name: build-tag
   pull: always
-  image: golang:1.13
+  image: golang:1.15
   commands:
   - "go build -v -ldflags '-X main.version=${DRONE_TAG##v} -X main.build=${DRONE_BUILD_NUMBER}' -a -o release/linux/arm64/drone-telegram"
   environment:
@@ -173,7 +173,7 @@ steps:
 
 - name: executable
   pull: always
-  image: golang:1.13
+  image: golang:1.15
   commands:
   - ./release/linux/arm64/drone-telegram --help
 
@@ -229,7 +229,7 @@ platform:
 steps:
 - name: build-push
   pull: always
-  image: golang:1.13
+  image: golang:1.15
   commands:
   - "go build -v -ldflags '-X main.build=${DRONE_BUILD_NUMBER}' -a -o release/linux/arm/drone-telegram"
   environment:
@@ -241,7 +241,7 @@ steps:
 
 - name: build-tag
   pull: always
-  image: golang:1.13
+  image: golang:1.15
   commands:
   - "go build -v -ldflags '-X main.version=${DRONE_TAG##v} -X main.build=${DRONE_BUILD_NUMBER}' -a -o release/linux/arm/drone-telegram"
   environment:
@@ -252,7 +252,7 @@ steps:
 
 - name: executable
   pull: always
-  image: golang:1.13
+  image: golang:1.15
   commands:
   - ./release/linux/arm/drone-telegram --help
 
@@ -308,7 +308,7 @@ platform:
 steps:
 - name: build-all-binary
   pull: always
-  image: golang:1.13
+  image: golang:1.15
   commands:
   - make release
   when:

pipeline.libsonnet

@@ -9,7 +9,7 @@
     steps: [
       {
         name: 'vet',
-        image: 'golang:1.13',
+        image: 'golang:1.15',
         pull: 'always',
         commands: [
           'make vet',
@@ -23,7 +23,7 @@
       },
       {
         name: 'lint',
-        image: 'golang:1.13',
+        image: 'golang:1.15',
         pull: 'always',
         commands: [
           'make lint',
@@ -37,7 +37,7 @@
       },
       {
         name: 'misspell',
-        image: 'golang:1.13',
+        image: 'golang:1.15',
         pull: 'always',
         commands: [
           'make misspell-check',
@@ -51,7 +51,7 @@
       },
       {
         name: 'test',
-        image: 'golang:1.13',
+        image: 'golang:1.15',
         pull: 'always',
         environment: {
           TELEGRAM_TOKEN: { 'from_secret': 'telegram_token' },
@@ -95,7 +95,7 @@
     steps: [
       {
         name: 'build-push',
-        image: 'golang:1.13',
+        image: 'golang:1.15',
         pull: 'always',
         environment: {
           CGO_ENABLED: '0',
@@ -111,7 +111,7 @@
       },
       {
         name: 'build-tag',
-        image: 'golang:1.13',
+        image: 'golang:1.15',
         pull: 'always',
         environment: {
           CGO_ENABLED: '0',
@@ -125,7 +125,7 @@
       },
       {
         name: 'executable',
-        image: 'golang:1.13',
+        image: 'golang:1.15',
         pull: 'always',
         commands: [
           './release/' + os + '/' + arch + '/' + name + ' --help',
@@ -190,7 +190,7 @@
     steps: [
       {
         name: 'build-all-binary',
-        image: 'golang:1.13',
+        image: 'golang:1.15',
         pull: 'always',
         commands: [
           'make release'