change drone ci to allow for testing with older versions.

.drone.yml

@@ -7,17 +7,36 @@ workspace:
   path: irc/
 
 pipeline:
-  test:
-    name: test-go-${GO_VERSION}
-    image: golang:${GO_VERSION}
+  test-1.10:
+    image: golang:1.10
+    commands:
+      - mkdir -p /go/src/github.com/gissleh/
+      - mv /project/irc /go/src/github.com/gissleh/
+      - cd /go/src/github.com/gissleh/irc/
+      - go get
+      - go test ./... -v
+      - go test -bench ./...
+  test-1.11:
+    image: golang:1.11
+    commands:
+      - go mod download
+      - go test ./... -v
+      - go test -bench ./...
+  test-1.12:
+    image: golang:1.12
+    commands:
+      - go mod download
+      - go test ./... -v
+      - go test -bench ./...
+  test-1.13:
+    image: golang:1.13
+    commands:
+      - go mod download
+      - go test ./... -v
+      - go test -bench ./...
+  test-1.14:
+    image: golang:1.14
     commands:
       - go mod download
       - go test ./... -v
       - go test -bench ./...
-
-matrix:
-  GO_VERSION:
-   - "1.11"
-   - "1.12"
-   - "1.13"
-   - "1.14"