go: update to 1.15

Author: Sameer Naik

.circleci/config.yml

@@ -8,7 +8,7 @@ jobs:
   checkout:
     executor:
       name: go/default
-      tag: '1.14'
+      tag: '1.15'
     steps:
       - checkout
       - go/mod-download-cached
@@ -21,7 +21,7 @@ jobs:
   build:
     executor:
       name: go/default
-      tag: '1.14'
+      tag: '1.15'
     steps:
       - attach_workspace:
           at: ~/
@@ -38,7 +38,7 @@ jobs:
   test:
     executor:
       name: go/default
-      tag: '1.14'
+      tag: '1.15'
     steps:
       - attach_workspace:
           at: ~/
@@ -86,7 +86,7 @@ jobs:
   release:
     executor:
       name: go/default
-      tag: '1.14'
+      tag: '1.15'
     steps:
       - attach_workspace:
           at: ~/

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.14 AS build
+FROM golang:1.15 AS build
 
 ENV CGO_ENABLED=0
 ENV GOOS=linux