Merge pull request src-d#260 from mcarmonaa/improvement/update-enry-d… …ependency Update enry dependency to v1.6.4

Merge pull request src-d#188 from ajnavarro/fix/makefile Fix error on Makefile

Upgrade to latest go-git version. (src-d#124) Do small changes to be able to use the last go-git v4 version.

fix table schemas in README 

rename to gitquery, closessrc-d#83 (src-d#118) 

expression: Add regexp support (src-d#105) 

cmd: very basic REPL implementation (src-d#97) * cmd: very basic REPL implementation Basic REPL that only supports query executions.

sql: add GROUP BY support. Closessrc-d#52. (src-d#86) * sql: add AggregationExpression interface. * sql: add function registry to Catalog. * sql/expression: add Count and First implementations. * sql/plan: add GroupBy node.

git: add objects table, closessrc-d#54 (src-d#77) 

sql: support DESCRIBE table. (src-d#66)