js extension not added to lib/*.js

[atoy40]

The current version does not have the .js added to import statments in lib/*.js compiled files
this is because the TS compiler return an error :

node_modules/.bin/tsc
src/use-context.ts:60:18 - error TS2774: This condition will always return true since the function is always defined. Did you mean to call it instead?

60     this.value = unsubscribe ? value : Context.defaultValue;
                    ~~~~~~~~~~~


Found 1 error.

So the next command in the makefile (sed) is not called. I've fixed this error and then sed has been call successfully.

Anthony.

[matthewp]

Can you send a PR?