Allows the installation of phplint over symfony 3.1.* packages

[rmrhz]

• same as title
• replace "~" with "^" to respect semver

[overtrue]

@rmrhz Hi, Maybe the contraints should be: ^2.7|^3.0:

because: ^2.7 will be satisfied by any version matching >=2.7.0 <3.0.0

so, ^2.7|^3.0 equals to ^2.7|^3.0|^3.1, will be satisfied by any version matching: >=2.7.0 <4.0.0

FYI:

• https://blog.madewithlove.be/post/tilde-and-caret-constraints/
• http://jubianchi.github.io/semver-check/
• https://semver.mwl.be/#?package=symfony%2Fconsole&version=%5E2.1&minimum-stability=stable

[rmrhz]

@overtrue noted, made changes.

[overtrue]

@rmrhz Thanks.