travis, appveyor: update to Go 1.10.3

.travis.yml

@@ -146,7 +146,7 @@ matrix:
       git:
         submodules: false # avoid cloning ethereum/tests
       before_install:
-        - curl https://storage.googleapis.com/golang/go1.10.2.linux-amd64.tar.gz | tar -xz
+        - curl https://storage.googleapis.com/golang/go1.10.3.linux-amd64.tar.gz | tar -xz
         - export PATH=`pwd`/go/bin:$PATH
         - export GOROOT=`pwd`/go
         - export GOPATH=$HOME/go

appveyor.yml

@@ -23,8 +23,8 @@ environment:
 install:
   - git submodule update --init
   - rmdir C:\go /s /q
-  - appveyor DownloadFile https://storage.googleapis.com/golang/go1.10.2.windows-%GETH_ARCH%.zip
-  - 7z x go1.10.2.windows-%GETH_ARCH%.zip -y -oC:\ > NUL
+  - appveyor DownloadFile https://storage.googleapis.com/golang/go1.10.3.windows-%GETH_ARCH%.zip
+  - 7z x go1.10.3.windows-%GETH_ARCH%.zip -y -oC:\ > NUL
   - go version
   - gcc --version