converted to go modules, added gorilla web toolkit, added test, changed yosoy to respond with JSON rather than plain text, added travis support

TestDockerfile

@@ -0,0 +1,15 @@
+FROM golang:1.15.7-alpine3.13 as builder
+
+LABEL maintainer="Łukasz Budnik lukasz.budnik@gmail.com"
+
+# build yosoy
+ADD . /go/yosoy
+RUN cd /go/yosoy && go build
+
+FROM alpine:3.13
+COPY --from=builder /go/yosoy/yosoy /bin
+
+# register entrypoint
+ENTRYPOINT ["yosoy"]
+
+EXPOSE 80